Adds missing references to modules.json

on-site-vtt/module.json

@@ -33,6 +33,11 @@
     "license" :"https://gitea.aweleczka.de/aweleczka/On-Site-VTT/raw/branch/main/LICENSE.txt",
     "flags": {
         "allowBugReporter": true
-    }
+    },
-
+    "styles": [
+      "./styles/on-site-vtt.css"
+    ],
+    "scripts": [
+      "./scripts/on-site-vtt.js"
+    ]
   }