Migrate PIP resources from SystemUI to WM shell lib (3/N)

Note: packages/SystemUI/res/values-sl/strings.xml contain blocked
      keywords, left the strings file unchanged
Test: make SystemUI
Test: make ArcSystemUI
Test: make WindowManager-Shell
Test: atest SystemUITests
Bug: 161118569
Change-Id: I1c70d4e92befdc2e53723eec66fe1e6477b9ea14