Fix spell mistake from exisiting to existing

Fix log spell from `Reusing exisiting view` to `Reusing existing view.

Author: leocaseiro

src/nativescript-angular/directives/list-view-comp.ts

@@ -64,7 +64,7 @@ export class ListViewComponent {
         let viewRef: EmbeddedViewRef;
 
         if (args.view) {
-            console.log("ListView.onItemLoading: " + index + " - Reusing exisiting view");
+            console.log("ListView.onItemLoading: " + index + " - Reusing existing view");
             viewRef = args.view[NG_VIEW];
         }
         else {
@@ -126,4 +126,4 @@ function getSingleViewFromViewRef(viewRef: EmbeddedViewRef): View {
     }
 
     return getSingleViewRecursive(viewRef.rootNodes, 0);
-}
+}