Improve Wi-Fi Settings UI in guest mode

Progress bar is still seen along with a permission forbidden tip in
guest mode and it's confusing. It should be hidden because actually
nothing happens there.

When Wi-Fi is off, Wi-Fi OFF tip should be shown even in guest mode
becuase it should be consistent with Wi-Fi status.

Improves d8c3ca43163427a75c8b70114096238177f97af0.

Bug:31235488
Test: manual inspection.

Change-Id: I611719db253a0aec03d61e881af0e5dc3869d50b
Merged-In: If89728e293721cea45dcd717316d87f6df17ea7c