Switch to side-by-side view

--- a/Allura/allura/lib/widgets/file_browser.py
+++ b/Allura/allura/lib/widgets/file_browser.py
@@ -1,6 +1,6 @@
 import ew
 
 class TreeWidget(ew.Widget):
-    template='allura.lib.widgets.templates.tree_widget'
+    template='jinja:tree_widget.html'
     params=['tree']
     tree=None