Removing accessibility description from page indicators

The current page is announced upon switching to it.
Is should be done this way for all future page implementations with
indicators.

Bug: 77827828
Test: Manual
Change-Id: I8f2f163a261dd7098939674d39e014236fc66d5d

src/com/android/launcher3/pageindicators/PageIndicator.java

@@ -25,6 +25,4 @@ public interface PageIndicator {
     void setActiveMarker(int activePage);
 
     void setMarkersCount(int numMarkers);
-
-    void setPageDescription(CharSequence description);
 }