WebCommit: Fix displaying of files after multiselect

This was borked when adding the context sizing, because
the multiselect still changed the whole title rather than
only the text span part.

html/views/commit/multipleSelection.js

@@ -1,7 +1,7 @@
 var showMultipleFilesSelection = function(files)
 {
 
-	$("title").innerHTML = "Multiple selection";
+	setTitle("Multiple selection");
 
 	var div = $("diff");