Fix typo: exisiting => existing

[tsymalla]

Description

Fixes an typo: exisiting => existing that appears in the launch screen.

Checklist

• [ X ] I read and understood the contributing guide as well as the code of conduct
• [X ] My changes generate no new warnings
• [ X ] My code builds and runs on my machine
• [ ] I documented my code
• [ X ] Review requested

Screenshots