Cleaned up more unused code in <GhTagSettingsForm>
Cleaned up more unused code in <GhTagSettingsForm>

refs https://github.com/TryGhost/Ghost-Admin/commit/704cbcfb4d9935e7d17fddae651b85642074e6e4

- `reset()` method was previously removed as it's no longer needed
- supporting code for calling that method was missed in the previous cleanup

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost