DesktopTasksController: Create VisualIndicator w/ Display's Context.

Instead of using the default Context that's injected, use a display
context that's of the current task's.

Bug: 382023296
Test: Build
Flag: com.android.window.flags.enable_bug_fixes_for_secondary_display
Change-Id: I33e0db3a4cd6a0cb42cc33e29b6a5d6e28ff4799