Attempt to fix Twinopen regression (avoid styling the home button onload), a=mconnor

browser/base/content/browser.xul

@@ -271,7 +271,7 @@
                      command="Browser:Stop"
                      tooltiptext="&stopButton.tooltip;"/>
 
-      <toolbarbutton id="home-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+      <toolbarbutton id="home-button" class="bookmark-item chromeclass-toolbar-additional"
                      label="&homeButton.label;"
                      ondragover="nsDragAndDrop.dragOver(event, homeButtonObserver);"
                      ondragdrop="nsDragAndDrop.drop(event, homeButtonObserver);"