#198579 follow up by webernet: a small coding style fix

install.php

@@ -817,7 +817,7 @@ function _install_module_batch($module, $module_name, &$context) {
   // steps.
   module_enable(array($module));
   $context['results'][] = $module;
-  $context['message'] = 'Installed '. $module_name. ' module.';
+  $context['message'] = 'Installed '. $module_name .' module.';
 }
 
 /**