Reduce the number of calls to updateAllPreferences

We call updateAllPreferences in onCreate and onResume. If we always call
the method in onResume, the call in onCreate seemed redundant.

Bug: 327052480
Flag: EXEMPT low risk bugfix
Test: manual (able to see the accessibility screen as before)
Test: atest com.android.settings.accessibility
Change-Id: I40b44ed6b667f7b1375ec0e339fc2b28a3f70dc5