fix: appid spec

It's optional on POST, so not readonly and not required.

Author: jmattheis

docs/spec.json

@@ -2943,17 +2943,15 @@
       "title": "MessageExternal Model",
       "required": [
         "id",
-        "appid",
         "message",
         "date"
       ],
       "properties": {
         "appid": {
-          "description": "The application id that send this message.",
+          "description": "The application id that send this message. Always set when returned via the API.",
           "type": "integer",
           "format": "int64",
           "x-go-name": "ApplicationID",
-          "readOnly": true,
           "example": 5
         },
         "date": {

model/message.go

@@ -27,10 +27,8 @@ type MessageExternal struct {
 	// required: true
 	// example: 25
 	ID uint `json:"id"`
-	// The application id that send this message.
+	// The application id that send this message. Always set when returned via the API.
 	//
-	// read only: true
-	// required: true
 	// example: 5
 	ApplicationID uint `json:"appid"`
 	// The message. Markdown (excluding html) is allowed.