Fix android search-bar bug (#5046)

* Fix android search-bar bug

Searching twice for the same item in the search bar leads to a bug where `submit` event won't be raised.
This PR fixes https://github.com/NativeScript/NativeScript/issues/5039

* test: include new test page

tns-core-modules/ui/search-bar/search-bar.android.ts

@@ -43,6 +43,7 @@ function initializeNativeClasses(): void {
             }
 
             this[SEARCHTEXT] = newText;
+            this[QUERY] = undefined;
             return true;
         }