Replace the tab key with 4 spaces in olstoy editor

[rydrman]

Description

Updates the osltoy application to use 4 spaces in the editor window instead of tab characters.

Tests

I'm not sure that this change warrants a test case, but I did launch the application and ensure that the tab key does indeed insert 4 spaces into the exitor.

Checklist:

• [x] I have read the contribution guidelines.
• [x] I have updated the documentation, if applicable.
• [ ] I have ensured that the change is tested somewhere in the testsuite (adding new test cases if necessary).
• [x] My code follows the prevailing code style of this project. If I haven't already run clang-format v17 before submitting, I definitely will look at the CI test that runs clang-format and fix anything that it highlights as being nonconforming.

[linux-foundation-easycla[bot]]

• :x: - login: @rydrman / name: Ryan Bottriell . The commit (7cc2a5ec9cebb75b61bced8d0cf803f5115575a6) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[rydrman]

Sounds like ILM is going to handle the dev days CLAs all together in the coming days, but I'm aware that it needs to be done here still