Clean up flag(2): com.android.window.flags.always_draw_magnification_fullscreen_border

Clean up the flag usages in the services/core directory.

Bug: 377211252
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/accessibility/magnification
Test: atest WindowManagerServiceTests
Flag: com.android.window.flags.always_draw_magnification_fullscreen_border
Change-Id: Iebe2a70fe2703294e6d46a509a884bbabe39ce89
2 files changed