Remove redundant call of queryInputMethodServicesInternal

This is a follow up CL to my previous CL [1], which introduced
InputMethodSettingsRepository as a read-only mode.

There was a redundant invocation of

  InputMethodManagerService#queryInputMethodServicesInternal,

in

  MyPackageMonitor#onFinishPackageChangesInternal().

This CL fixes it.

 [1]: Iccede363caffb04087f511b6585cf07565dafda1
      90622cfc

Bug: 309837937
Test: presubmit
Change-Id: I9437455cd9ad907a3587b8087c2aa2620ef4c8fd