include groups in .../files?show_all_contexts=1

get_all_pertinent_contexts takes one parameter, include_groups, which
defaults to false. fixes #5777

Change-Id: I412249a180a4325b59ee69020f675f015059c191
Reviewed-on: https://gerrit.instructure.com/5880
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Brian Whitmer <brian@instructure.com>

Author: lukfugl

app/controllers/files_controller.rb

@@ -95,7 +95,7 @@ def full_index
     add_crumb(t('#crumbs.files', "Files"), named_context_url(@context, :context_files_url))
     @contexts = [@context]
     if !@context.is_a?(User) || (@context == @current_user && params[:show_all_contexts])
-      get_all_pertinent_contexts
+      get_all_pertinent_contexts(true)
     end
     @too_many_contexts = @contexts.length > 15
     @contexts = @contexts[0,15]