Bug 1152678 - Move Lightning preference pane to the left of Advanced. r=Fallen

MozReview-Commit-ID: 4FSJuTTXBTl

calendar/lightning/content/messenger-overlay-preferences.xul

@@ -17,6 +17,7 @@
 
     <prefwindow id="MailPreferences">
         <prefpane id="paneLightning"
+                  insertbefore="paneAdvanced"
                   label="&lightning.preferencesLabel;"
                   onpaneload="gCalendarGeneralPane.init(); gAlarmsPane.init();
                               gCategoriesPane.init(); gViewsPane.init();