Add "Uninstall app" string for private space shortcut.

Before: https://screenshot.googleplex.com/8RvbiWnJmgAvSYf.png
After: https://screenshot.googleplex.com/4e7N3rr8EAH7k6B.png

Bug: 335451332
Flag: com.android.launcher3.enable_private_space
Flag: EXEMPT resource only update
Test: Manual
Change-Id: I759005f51562683cb6c095abcca27d448acd10f8