ensure 0x prefixed

libs/remix-debug/src/trace/traceManager.ts

@@ -151,7 +151,7 @@ export class TraceManager {
     if (this.trace[stepIndex] && this.trace[stepIndex].stack) { // there's always a stack
       const stack = this.trace[stepIndex].stack.slice(0)
       stack.reverse()
-      return stack
+      return stack.map(el => el.startsWith('0x') ? el : '0x' + el)
     } else {
       throw new Error('no stack found')
     }