CRM_Core_CodeGen_Util_Template - Fix warning

Example warning: "PHP Warning:  unlink(../sql/civicrm_data.da_DK.mysql): No such file or directory in /home/webeditor/jenkins-node/workspace/buildkit-demos.civicrm.org/build/d7-sandbox/sites/all/modules/civicrm/CRM/Core/CodeGen/Util/Template.php on line 56"