Refresh params after ENABLE params

[Jaaaky]

Hello,
When the user enables (or disables) an ENABLE param on ardupilot, the GCS should ask the user to refresh params to show newly enabled params.

[rubenCodeforges]

@Jaaaky what version have you tried this on ?

[Jaaaky]

Sorry, should have mentioned it
It's on alpha-29-rc1

I tested on VTX_ENABLE for example.