cmd/pkgserver: fix multi-line JS test output display

cmd/pkgserver/ui/static/test.ts

@@ -116,8 +116,8 @@ function extractExceptionString(e: any): string {
     // properties.
     const s = String(e);
     if (!(e instanceof Error && "stack" in e)) return s;
-    // v8 (Chromium, NodeJS) include the error message, while Firefox and WebKit
-    // do not.
+    // v8 (Chromium, NodeJS) include the error message, while
+    // Firefox and WebKit do not.
     if (e.stack.startsWith(s)) return e.stack;
     return `${s}\n${e.stack}`;
 }