Revert^2 "Disable user aspect ratio button if app not launchable"

We exclude apps that do not have launchable activities in Settings >
Apps > Aspect ratio (experimental), so we should not show user aspect
ratio button in apps that do not have a launcher category.

This will remove button from showing in DeviceAsWebcam and Android Auto
transparent activity pop-up.

Bug: 308391262
Test: atest UserAspectRatioSettingsWindowManagerTest
      Steps in b/309377965 & b/309370256
Change-Id: I620bd2c7c8154dff42ce59fba81b109fcba447ac