Clean up unused aconfig flag `activity_embedding_support_for_connected_displays`.

This flag has been migrated to the new flag in the LSE namespace com.android.window.flags.enable_activity_embedding_support_for_connected_displays

Bug: 369438353
Test: Build
Flag: EXEMPT removing com.android.window.flags.activity_embedding_support_for_connected_displays
Change-Id: I60feccea7b7bdaa3807a4a7c64deea8db599c999
1 file changed