Check if PageIndicator's width matches the number of pages.

PageIndicator sometimes get in a state where the width isn't always updated when the number of pages change (possibly linked to if PageIndicator is visible at the time or not)
Adding this check forces a width recalculation if it doesn't match the current number of pages.

Fix: 322540792
Flag: none
Test: manually, opening QS
Change-Id: I12f584b2cd86db5a0c7e02fb88dcfaeb80893d42