Autoclick: Change panel layout type

Using TYPE_NAVIGATION_BAR_PANEL allows for the panel to be showed on the
lock screen. This matches the implementation of the a11y Magnification
window settings which is also available on the lock screen.

Bug: 432062178
Test: AutoclickPanelTests
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: Ic6bcc5330c438e4c6661365ebedfaec99f328942