[BUG] `chcolor` freezes when provided incorrect values

**To Reproduce** Steps to reproduce the unwanted behavior: 1. Build and run the [main](https://github.com/adamperkowski/highlightos/tree/main) branch version of Highlight OS. 2. Run `chcolor` with incorrect values ([color list](https://github.com/adamperkowski/highlightos/wiki/Core#currently-available-colors-user)) **Expected behavior** Command should return 4 ([here](https://github.com/adamperkowski/highlightos/commit/aaec972e342cce451a2fa354c705b56201ae4cc7) and [here](https://github.com/adamperkowski/highlightos/wiki/Core#return-codes)) **Screenshots / photos** https://github.com/user-attachments/assets/c1d76636-8f61-4bc3-b07b-d6f2ca612acb **Desktop (please complete the following information):** - QEMU Version: 9.0.2-1 - Release Version: main branch [this](https://github.com/adamperkowski/highlightos/commit/aaec972e342cce451a2fa354c705b56201ae4cc7) commit - Debug / Release binary: both