Remove redundant metafield alias from local-pickup queries

The queries had `metafield: metafield(...)` which creates a redundant alias. This caused issues with the test helper library's query-to-fixture matching. Removed the alias to use just `metafield(...)`.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: lopert

functions-local-pickup-delivery-option-generators-js/src/run.graphql.liquid

@@ -22,7 +22,7 @@ query RunInput {
     }
   }
   deliveryOptionGenerator {
-    metafield: metafield(namespace: "$app:local-pickup-options-generator", key: "pickup-ids") {
+    metafield(namespace: "$app:local-pickup-options-generator", key: "pickup-ids") {
       value
     }
   }

functions-local-pickup-delivery-option-generators-rs/src/run.graphql.liquid

@@ -22,7 +22,7 @@ query Input {
     }
   }
   deliveryOptionGenerator {
-    metafield: metafield(namespace: "$app:local-pickup-options-generator", key: "pickup-ids") {
+    metafield(namespace: "$app:local-pickup-options-generator", key: "pickup-ids") {
       value
     }
   }