optimize: improve mintAdditionalSupplyTo efficiency (#5148)

## Problem solved

Short description of the bug fixed or feature added

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---

## PR-Codex overview
This PR focuses on optimizing the `mintAdditionalSupplyTo` function in the `erc1155` extension by modifying how the token URI is handled during the minting process.

### Detailed summary
- Removed the retrieval of the existing token URI from the contract.
- Set the `uri` field to an empty string, indicating the contract will maintain the existing token URI.
- Kept the `to`, `tokenId`, and `amount` fields unchanged.

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.changeset/olive-wombats-prove.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+Optimize mintAdditionalSupplyTo

packages/thirdweb/src/extensions/erc1155/write/mintAdditionalSupplyTo.ts

@@ -38,16 +38,10 @@ export function mintAdditionalSupplyTo(
   return MintTo.mintTo({
     contract: options.contract,
     asyncParams: async () => {
-      // we'll be re-using the exising token URI
-      const tokenUri = await URI.uri({
-        contract: options.contract,
-        tokenId: options.tokenId,
-      });
-
       return {
         to: options.to,
         tokenId: options.tokenId,
-        uri: tokenUri,
+        uri: "", // contract will maintain the existing token URI
         amount: options.supply,
       };
     },