Add kotlin-annotations to WindowManager-Shell

Soong normally adds kotlin-annotations as a dependency to any module
that uses kotlin sources, but it can't find the kotlin sources in
WindowManager-Shell because they are all in a filegroup.  Add it
manually as a workaround.

Bug: 225013372
Test: m checkbuild
Change-Id: I3b61702b13ae72d4cb20620dfbf9707f4b8aaaaa