fix: make close button close wake calculator

[19wintersp]

Makes the close button on the titlebar close the wake calculator.

I can't build this, so I have no idea if it works; sorry. Functionality works, tests should too

[19wintersp]

Totally forgot about this, @AndyTWF would you mind reviewing please?

Still trying to get cross-compilation working, which EuroScope isn't particularly helping with

[AxonC]

@19wintersp did you manage to resolve this?

[19wintersp]

Forgot about this PR again 😅

@19wintersp did you manage to resolve this?

I never did manage to get it to build on my system, either through Wine or via clang-cl, but that was some time ago. I may give it another go if I find the time or a Windows system—really ought to be quite simple in the latter case, one would expect

[kristiankunc]

@19wintersp please rebase so we get the build check here

[19wintersp]

Merge instead of rebase due on mobile and no time

[kristiankunc]

Looks like it just needs clang format and it's good to go