Added data refresh after new shortcut is added/deleted

This causes shortcut custom shortcut repository to get updated leading
to an update in shortcuts being displayed in the UI.

Fix: 379718710
Test: CustomShortcutCategoriesRepositoryTest
Test: CustomInputGesturesRepositoryTest
Flag: com.android.systemui.keyboard_shortcut_helper_shortcut_customizer
Change-Id: Ie6c11981875038ccc8ca28662b1db0c5a2dd8e4a