Implemented close action on TaskLists Dialog Fragment

app/src/main/java/com/wismna/geoffroy/donext/fragments/MainFragment.java

@@ -53,6 +53,7 @@ public class MainFragment extends Fragment implements TasksFragment.TaskChangedA
      * @return A new instance of fragment MainFragment.
      */
     // TODO: Rename and change types and number of parameters
+    // TODO: History should get its own activity and this fragment
     public static MainFragment newInstance(boolean isHistory) {
         MainFragment fragment = new MainFragment();
         Bundle args = new Bundle();

app/src/main/java/com/wismna/geoffroy/donext/fragments/TaskListsDialogFragment.java

@@ -121,7 +121,7 @@ public class TaskListsDialogFragment extends DynamicDialogFragment implements
 
     @Override
     protected void onNegativeButtonClick() {
-        // TODO: close fragment
+        dismiss();
     }
 
     @Override