Remove option to participate in release candidates from preferences

indra/newview/skins/default/xui/en/panel_preferences_setup.xml

@@ -504,18 +504,6 @@
      top_pad="2"
      name="media_popup_enabled"
      width="200"/>
-  <check_box
-    top_delta="4"
-    enabled="true"
-    follows="left|top"
-    height="14"
-    control_name="UpdaterWillingToTest"
-    label="Willing to update to release candidates"
-    left_delta="0"
-    mouse_opaque="true"
-    name="update_willing_to_test"
-    width="400"           
-    top_pad="5"/>
     <text
      type="string"
      length="1"