Remove group by attribute from header.

app/assets/javascripts/app/controllers/_application_controller_table.coffee

@@ -134,6 +134,9 @@ class App.ControllerTable extends App.Controller
       headerFound = false
       for attributeName, attribute of attributes
 
+        # remove group by attribute from header
+        if !@groupBy || @groupBy isnt item
+
           if !attribute.style
             attribute.style = {}
 
@@ -188,14 +191,6 @@ class App.ControllerTable extends App.Controller
     # group by
     if @groupBy
 
-      # remove group by attribute from header
-      overview = _.filter(
-        overview
-        (item) =>
-          return item if item isnt @groupBy
-          return
-      )
-
       # get new order
       groupObjects = _.groupBy(
         @objects