remove unused code

libs/remix-lib/src/execution/txRunner.ts

@@ -32,10 +32,6 @@ export class TxRunner {
   }
 
   execute (args: Transaction, confirmationCb, gasEstimationForceSend, promptCb, callback) {
-    let data = args.data
-    if (data.slice(0, 2) !== '0x') {
-      data = '0x' + data
-    }
     this.internalRunner.execute(args, confirmationCb, gasEstimationForceSend, promptCb, callback)
   }
 }