Fix source entry

Author: lwindolf

glade/simple_subscription.ui

@@ -109,6 +109,7 @@
                     <property name="can-focus">False</property>
                     <property name="xpad">6</property>
                     <property name="label" translatable="yes">Feed _Source</property>
+                    <property name="mnemonic_widget">sourceEntry</property>
                     <property name="use-underline">True</property>
                     <attributes>
                       <attribute name="weight" value="bold"/>
@@ -121,7 +122,7 @@
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkEntry">
+                  <object class="GtkEntry" id="sourceEntry">
                     <property name="visible">True</property>
                     <property name="can-focus">True</property>
                     <property name="margin-end">6</property>