[FIX] Multiple assets in combiner url

[jaxwilko]

Added fix to ensure multiple assets are included in combination url.

Reported by @mjauvin

Test case:

{% set styleAssets = [
  'assets/css/test1.css',
  'assets/css/test2.css',
] %}

<link rel="stylesheet" href="{{ styleAssets | theme }}">

Result, only the first file was included.

[what-the-diff]

PR Summary

• 📝 Refined break statement in Controller
  A minor update made to improve code consistency.
• 🧪 New test case for themeCombineAssets()
  A new test ensures that URL generation, cache key extraction, and config decoding work correctly when combining multiple asset files into a single bundle using OctoberCMS framework's combiner library. This also checks that input and output file names remain the same.