package installer: remove left over string resources for wear

Currently WearOS allows installing APKs, both wear_not_allowed_dlg_title
and wear_not_allowed_dlg_text are no longer in use.
So that clean up two resources.

Defer-CP-To-Master: 313415715
Bug: 313415715
Test: m
Change-Id: Ia6e36d137214d207d30e89e9172babd1fb2058be