software/cloudooo: fix input schema JSON

software/cloudooo/instance-cloudooo-input-schema.json

@@ -18,6 +18,7 @@
     },
     "mimetype-entry-addition": {
       "description": "The list of entry to add to the cloudooo mimetype registry. Each entry should on one line which format is: \"<source_mimetype> <destination_mimetype> <handler>\"",
+      "textarea": true,
       "type": "string"
     }
   }