fix e2e test

apps/remix-ide-e2e/src/tests/debugger.test.ts

@@ -206,7 +206,7 @@ module.exports = {
       .addFile('test_jsGetTrace.js', { content: jsGetTrace })
       .executeScriptInTerminal('remix.exeCurrent()')
       .pause(3000)
-      .waitForElementContainsText('*[data-id="terminalJournal"]', '{"gas":"0x575f","return":"0x0000000000000000000000000000000000000000000000000000000000000000","structLogs":', 60000)
+      .waitForElementContainsText('*[data-id="terminalJournal"]', '{"gas":"0x575f","return":"0x","structLogs":', 60000)
   },
   // depends on Should debug using generated sources
   'Should call the debugger api: debug #group4': function (browser: NightwatchBrowser) {

libs/remix-simulator/src/VmProxy.ts

@@ -191,7 +191,7 @@ export class VmProxy {
       this.vmTraces[this.processingHash].return = toChecksumAddress(address)
       this.txsReceipt[this.processingHash].contractAddress = toChecksumAddress(address)
     } else if (data.execResult.returnValue) {
-      this.vmTraces[this.processingHash].return = data.execResult.returnValue
+      this.vmTraces[this.processingHash].return = '0x' + data.execResult.returnValue.toString('hex')
     } else {
       this.vmTraces[this.processingHash].return = '0x'
     }