chg: [dev] change post-id attribute type to text

Author: VVX7

objects/facebook-post/definition.json

@@ -68,7 +68,7 @@
     },
     "post-id": {
       "description": "The facebook post id.",
-      "misp-attribute": "post-id",
+      "misp-attribute": "text",
       "ui-priority": 0
     },
     "post-location": {