chore: fixing express example

[obecny]

express example doesn't have service name

[codecov]

Codecov Report

Merging #573 (641391c) into main (9dabf39) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 641391c differs from pull request most recent head 9d34c19. Consider uploading reports for the commit 9d34c19 to get more accurate results

@@            Coverage Diff             @@
##             main     #573      +/-   ##
==========================================
- Coverage   94.77%   94.75%   -0.02%     
==========================================
  Files         179      169      -10     
  Lines       10946    10724     -222     
  Branches     1086     1066      -20     
==========================================
- Hits        10374    10162     -212     
+ Misses        572      562      -10     

Impacted Files	Coverage Δ
...ction/src/contentScript/InstrumentationInjector.ts
...er-extension-autoinjection/test/background.test.ts
...rc/background/ProgrammaticContentScriptInjector.ts
...er-extension-autoinjection/src/background/index.ts
...tension-autoinjection/test/instrumentation.test.ts
...etry-browser-extension-autoinjection/test/utils.ts
...metry-browser-extension-autoinjection/src/types.ts
...njection/src/instrumentation/WebInstrumentation.ts
...extension-autoinjection/src/contentScript/index.ts
...extension-autoinjection/test/contentScript.test.ts

[obecny]

restarting CLA