Test: Add more values to dataform test

So we can see a scrollbar

test/gtk/dataform.py

@@ -76,6 +76,9 @@
     <option label='Polls'><value>polls</value></option>
     <option label='Reminders'><value>reminders</value></option>
     <option label='Search'><value>search</value></option>
+    <option label='Search1'><value>search1</value></option>
+    <option label='Search2'><value>search2</value></option>
+    <option label='Search3'><value>search3</value></option>
     <value>news</value>
     <value>search</value>
   </field>