BUGFIX: Fix code migration

With the namespace change the code migration `TYPO3.Form-20160601101500` has not
been adjusted completely, see: dfa23c6#commitcomment-21736520

As a result, it adds new `TYPO3.Form.*` settings if the settings have been adjusted
to the new namespace (`Neos.Form.*`) already.

This change fixes this.

Fixes: #42

Migrations/Code/Version20160601101500.php

@@ -39,7 +39,7 @@ function (array &$configuration) {
 
                 $presetsConfiguration = $this->renameTranslationPackage($presetsConfiguration);
 
-                $configuration['TYPO3']['Form']['presets'] = $presetsConfiguration;
+                $configuration['Neos']['Form']['presets'] = $presetsConfiguration;
             },
             true
         );