Fix getSelectedIndices callback

library/src/main/java/com/afollestad/materialdialogs/MaterialDialog.java

@@ -1183,7 +1183,11 @@ public class MaterialDialog extends DialogBase implements View.OnClickListener,
     @Nullable
     public Integer[] getSelectedIndices() {
         if (listCallbackMulti != null) {
-            return selectedIndices;
+            Integer[] returnedIndicies = new Integer[selectedIndicesList.size()];
+            for (int i = 0; i < selectedIndicesList.size(); i++) {
+                returnedIndicies[i] = selectedIndicesList.get(i);
+            }
+            return returnedIndicies;
         } else {
             return null;
         }