Fix security vulnerability of non-dynamic permission removal

The original removePermission() code in PermissionManagerService
missed a logical negation operator when handling non-dynamic
permissions, causing both
testPermissionPermission_nonDynamicPermission_permissionUnchanged and
testRemovePermission_dynamicPermission_permissionRemoved tests in
DynamicPermissionsTest to fail.

The corresponding test DynamicPermissionsTest is also updated in the
other CL: ag/27073864

Bug: 321711213
Test: DynamicPermissionsTest on sc-dev and tm-dev locally
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:35d77a77feef62dc108f6478cb9228cc6044f70d)
Merged-In: Id573b75cdcfce3a1df5731ffb00c4228c513e686
Change-Id: Id573b75cdcfce3a1df5731ffb00c4228c513e686