Revert "use event.message when no event.error in HMR during event"

This reverts commit 438aaf9e95.

packages/bun-error/index.tsx

@@ -615,6 +615,7 @@ const NativeStackFrame = ({
       <div
         title={StackFrameScope[scope]}
         className="BunError-StackFrame-identifier"
+        // @ts-expect-error Custom CSS variables are not known by TypeScript
         style={{ "--max-length": `${maxLength}ch` }}
       >
         {getNativeStackFrameIdentifier(frame)}