Disable drag indicator for non-desktop-mode-supported display

This commit adds a check on isDesktopModeSupportedOnDisplay before
rendering the drag indicator on that display.

Bug: 383069176
Test: manual; atest WMShellUnitTests:MultiDisplayDragMoveIndicatorControllerTest
Flag: com.android.window.flags.enable_connected_displays_window_drag
Change-Id: I40b82ac54b58d8e58b7a87c8fe3c68cdda480e3c