Fix keyboard staying up in AOSP launcher.

The keyboard doesn't close when swiping down from A-Z list. So in Launcher when going to any state from A-Z getAPpsView().reset() gets called which eventually
calls resetSearch() where we can hideKeyboard.

bug: 379052503
Test: before in bug
after: https://drive.google.com/file/d/11oVTvkBtj9rECEtz4IVH1tURaJz6pFTO/view?usp=sharing
Flag: NONE bug fix
Change-Id: I707bf5dc2f81d5e83e869e34de674ef7fc065486

src/com/android/launcher3/allapps/search/AllAppsSearchBarController.java

@@ -150,6 +150,7 @@ public class AllAppsSearchBarController
         mCallback.clearSearchResult();
         mInput.reset();
         mInput.clearFocus();
+        mInput.hideKeyboard();
         mQuery = null;
     }