replace tab to space at app/models/query.rb

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10468 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/query.rb

@@ -323,7 +323,7 @@ class Query < ActiveRecord::Base
     @available_filters
   end
 
-	# Returns a representation of the available filters for JSON serialization
+  # Returns a representation of the available filters for JSON serialization
   def available_filters_as_json
     json = {}
     available_filters.each do |field, options|