Screen capture: Use different icons for selected/unselected state

Screenshot of "Capture" selected: http://screen/6hwx3rRmovcUwJN
Screenshot of "Capture" unselected: http://screen/8yRF9PDXj8SgnpV

Bug: 422832363
Test: Manual, PreCaptureViewModelTest, RadioButtonGroupItemViewModelTest
Flag: com.android.systemui.desktop_screen_capture
Change-Id: I22d63359815d75d2569bd88a966d3a21779145e7