Update the global focus state on onTaskInfoChanged without flag

decoration.mHasGlobalFocus is updated through ShellTransitions before
onTaskInfoChanged when the enableDisplayFocusInShellTransitions flag is
on, but not without the flag.
We need to update the mHasGlobalFocus when the flag is off on
onTaskInfoChanged.

Bug: 374159712
Flag: com.android.window.flags.enable_display_focus_in_shell_transitions
Test: atest DesktopModelWindowDecorViewModelTests
Change-Id: I64bf847bd15cc29b9714ca60ae5a8766e9f350b7