added required fields for codegen to button_id CAN message

Author: bjackson312006

can-messages/wheel.json

@@ -4,7 +4,10 @@
     "desc": "Wheel Buttons",
     "points": [
       {
-        "size": 8
+        "size": 8,
+        "signed": false,
+        "name": "button_id",
+        "c_type": "uint8_t"
       }
     ],
     "fields": [