Fixed display id on Instrumentation.sendKeySync().

By default, the displayId in the KeyEvents is always 0, which would
cause CTS tests to fail when they are running on background
users visible in different displays.

Bug: 266851112
Fixes: 268103680

Test: adb shell am start-user --display 2 13 && adb shell am instrument --user 13 -e class "android.app.cts.LauncherActivityTest" -w "android.app.cts/androidx.test.runner.AndroidJUnitRunner"

Change-Id: Ie9a68319f47c45f0a6b035ddcda13e8c5627f34f