ThemePicker: Fixup font and icon picking wrong user ID

Logs:
E AndroidRuntime: java.lang.SecurityException: Permission Denial: get/set setting for user asks to run as user -2 but is calling from uid u0a164; this requires android.permission.INTERACT_ACROSS_USERS_FULL
E AndroidRuntime:        at android.os.Parcel.createExceptionOrNull(Parcel.java:3021)
E AndroidRuntime:        at android.os.Parcel.createException(Parcel.java:3005)
E AndroidRuntime:        at android.os.Parcel.readException(Parcel.java:2981)
E AndroidRuntime:        at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:190)
E AndroidRuntime:        at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:142)
E AndroidRuntime:        at android.content.ContentProviderProxy.call(ContentProviderNative.java:732)
E AndroidRuntime:        at android.provider.Settings.getStringForUser(Settings.java:3202)
E AndroidRuntime:        at android.provider.Settings.getStringForUser(Settings.java:6814)
E AndroidRuntime:        at com.android.customization.model.font.FontManager.persistOverlay(FontManager.java:112)
E AndroidRuntime:        at com.android.customization.model.font.FontManager.apply(FontManager.java:63)
E AndroidRuntime:        at com.android.customization.picker.font.FontFragment.applyFontOption(FontFragment.java:134)
E AndroidRuntime:        at com.android.customization.picker.font.FontFragment.lambda-android-customization-picker-font-FontFragment(FontFragment.java:129)
E AndroidRuntime:        at com.android.customization.picker.font.FontFragment3405756ExternalSyntheticLambda1.onClick(Unknown Source:2)
E AndroidRuntime:        at com.android.wallpaper.widget.BottomActionBar.lambda-android-wallpaper-widget-BottomActionBar(BottomActionBar.java:346)
E AndroidRuntime:        at com.android.wallpaper.widget.BottomActionBar3405756ExternalSyntheticLambda3.onClick(Unknown Source:6)
E AndroidRuntime:        at android.view.View.performClick(View.java:7506)
E AndroidRuntime:        at android.view.View.performClickInternal(View.java:7483)
E AndroidRuntime:        at android.view.View.-3405756Nest(Unknown Source:0)
E AndroidRuntime:        at android.view.View.run(View.java:29342)
E AndroidRuntime:        at android.os.Handler.handleCallback(Handler.java:942)
E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:99)
E AndroidRuntime:        at android.os.Looper.loopOnce(Looper.java:201)
E AndroidRuntime:        at android.os.Looper.loop(Looper.java:288)
E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:7879)
E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
E AndroidRuntime:        at com.android.internal.os.RuntimeInit.run(RuntimeInit.java:550)
E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
E AndroidRuntime: Caused by: android.os.RemoteException: Remote stack trace:
E AndroidRuntime:        at com.android.server.am.UserController.handleIncomingUser(UserController.java:2270)
E AndroidRuntime:        at com.android.server.am.ActivityManagerService.handleIncomingUser(ActivityManagerService.java:12564)
E AndroidRuntime:        at android.app.ActivityManager.handleIncomingUser(ActivityManager.java:4297)
E AndroidRuntime:        at com.android.providers.settings.SettingsProvider.resolveCallingUserIdEnforcingPermissionsLocked(SettingsProvider.java:2298)
E AndroidRuntime:        at com.android.providers.settings.SettingsProvider.getSecureSetting(SettingsProvider.java:1570)

Change-Id: Iaff6e2e72ba24d81b8dbf16cca660b279455ff74