chore: cleanup

Author: farfromrefug

src/activityindicator/index.android.ts

@@ -3,13 +3,6 @@ import { ActivityIndicatorBase, indeterminateProperty } from './index-common';
 export class ActivityIndicator extends ActivityIndicatorBase {
     nativeViewProtected: android.widget.ProgressBar;
 
-    public startAnimating() {
-        this.busy = true;
-    }
-    public stopAnimating() {
-        this.busy = false;
-    }
-
     [indeterminateProperty.setNative](value: boolean) {
         this.busy = true;
         // not supported for now with circular progress

src/activityindicator/index.ios.ts

@@ -1,4 +1,5 @@
 import { themer } from '@nativescript-community/ui-material-core';
+import { busyProperty } from '@nativescript-community/ui-material-progress/progress-common';
 import { Color, Screen, Utils, View, colorProperty } from '@nativescript/core';
 import { ActivityIndicatorBase, indeterminateProperty } from './index-common';