Listen to lock mode change for connection dialog

Instead of only checking lock mode once, we instead listen for changes
and use the up to date value to generate the appropriate state of the
dialog

Bug: 429288575
Test: manual testing
Flag: com.android.window.flags.enable_updated_display_connection_dialog
Change-Id: Ic0969ed5d85a443339af31a7408ced296ec5bd92