Fix performance issue when browse big diffs

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/diffs/_diffs.html.haml

@@ -20,4 +20,4 @@
       Maybe diff is really big and operation failed with timeout. Try to get diff locally
 
 :coffeescript
-  $('.files .diff-header').stick_in_parent(recalc_every: 1, offset_top: $('.navbar').height())
+  $('.files .diff-header').stick_in_parent(offset_top: $('.navbar').height())