Make NetworkProviderSettings extend RestrictedDashboardFragment

RestrictedSettingsFragment is deprecated and no longer supported. To be
compatible with catalyst, change the super class to
RestrictedDashboardFragment.

Bug: 372733639
Test: atest NetworkProviderSettingsTest, manual tests with user restrictions
Flag: EXEMPT N/A
Change-Id: I02b08363dadd5739a1d348f099d439b9f82ffb18