remove duplicate mysql? and postgresql? logic

git-svn-id: http://svn.redmine.org/redmine/trunk@19710 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/test_helper.rb

@@ -190,11 +190,11 @@ class ActiveSupport::TestCase
   end
 
   def mysql?
-    ActiveRecord::Base.connection.adapter_name =~ /mysql/i
+    Redmine::Database.mysql?
   end
 
   def postgresql?
-    ActiveRecord::Base.connection.adapter_name =~ /postgresql/i
+    Redmine::Database.postgresql?
   end
 
   def quoted_date(date)