add int type for field parameter

Author: SpheMakh

stimela/cargo/cab/ragavi/parameters.json

@@ -41,7 +41,7 @@
         {
             "info": "Field ID to plot", 
             "name": "field", 
-            "dtype": "list:str",
+            "dtype": ["list:str","list:int"],
             "required": true, 
         },
         {
@@ -112,4 +112,4 @@
             "required": false
         } 
     ]
-}
+}