Fix security vulnerability of non-dynamic permission removal

The original removePermission() code in PermissionManagerServiceImpl
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
Change-Id: Ia146d4098643d9c473f8c83d33a8a125a53101fc