Fix etherscan urls

Author: krzkaczor

packages/ethereum-viewer/src/explorer/fetchFiles.test.ts

@@ -36,7 +36,7 @@ describe(fetchFiles.name, () => {
     await fetchFiles("optimistic.etherscan", "0x0", { fetch: f });
 
     const expectedPrefix =
-      "https://api-optimistic.etherscan.io/api?module=contract&action=getsourcecode&address=0x0&apikey=";
+      "https://api-optimistic.etherscan.io/api?&module=contract&action=getsourcecode&address=0x0&apikey=";
 
     assert(
       url?.startsWith(expectedPrefix),

packages/ethereum-viewer/src/explorer/fetchFiles.ts

@@ -44,7 +44,7 @@ export async function fetchFiles(
   const apiUrl = explorerApiUrls[apiName];
   const url =
     apiUrl +
-    "?module=contract" +
+    "&module=contract" +
     "&action=getsourcecode" +
     `&address=${contractAddress}` +
     `&apikey=${explorerApiKeys[apiName]}`;