fix(gong): align list calls block validation

Author: waleedlatif1

apps/sim/blocks/blocks/gong.ts

@@ -179,6 +179,7 @@ Return ONLY the JSON array - no explanations, no quotes, no extra text.`,
         field: 'operation',
         value: ['list_calls'],
       },
+      required: { field: 'operation', value: 'list_calls' },
       wandConfig: {
         enabled: true,
         prompt: `Generate an ISO 8601 timestamp based on the user's description.
@@ -203,7 +204,6 @@ Return ONLY the timestamp string in ISO 8601 format - no explanations, no quotes
         field: 'operation',
         value: ['list_calls'],
       },
-      required: { field: 'operation', value: 'list_calls' },
       wandConfig: {
         enabled: true,
         prompt: `Generate an ISO 8601 timestamp based on the user's description.