[FEATURE REQUEST] Uniget Icon Options

### Please confirm these before moving forward. - [x] I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue. - [x] This proposal is a completely new feature. If you want to suggest an improvement or an enhancement, please use [this template](https://github.com/Devolutions/UniGetUI/issues/new?labels=enhancement&projects=&template=enhancement-improvement.yml&title=%5BENHANCEMENT%5D+%28Enter+your+description+here%29). ### Describe the new feature I do not dislike the icon change, but Uniget' old icon with the grey gradient backdrop just fits with my theme so much better. Can we have a choice to which icon we use? At least for the taskbar icon? <img width="340" height="41" alt="Image" src="https://github.com/user-attachments/assets/b7ad3dd7-dea2-40e7-8fd9-56aae84a1807" /> ### Describe how this new feature could help users Purely Cosmetics.