core: frontend: extension settings reload with a flash

[ES-Alexander]

Current behaviour

Extension settings seem to reload every ~10 seconds, and they flash when doing so (even if there's no change):

blueos-extension-settings-refreshing-polish.mov

Expected or desired behaviour

Things that aren't changing shouldn't be drawing visual attention.

I'm not sure why the settings are reloading at all (it's not like they're expected to change externally), but if they must reload then they should preferably only have a visible change if the values change, and do nothing if the values have stayed the same.

Prerequisites

• I have checked to make sure that a similar request has not already been filed or fixed.