(no-ticket) Fix an error occuring during development deployment.

There is an error occuring during migrations with DEGUB=True set:
> You have 'APP_DIRS': True in your TEMPLATES but also specify 'loaders' in OPTIONS. Either remove APP_DIRS or remove the 'loaders' option.

Change-Id: I908285aaf9d1fd05bfe2b867adfdb0fcd2bb9093

oioioi/deployment/settings.py.template

@@ -14,6 +14,7 @@ DEBUG = True
 
 if DEBUG:
     TEMPLATES[0]['OPTIONS']['loaders'] = UNCACHED_TEMPLATE_LOADERS
+    TEMPLATES[0]['APP_DIRS'] = False
 
 # Site name displayed in the title and used by sioworkersd
 # to distinguish OIOIOI instances.