clamp_window_to_sane_position causes panic

[aevyrie]

Describe the bug

Demo app panics sporadically, hard to reproduce reliably, but seems to get stuck in a broken state, presumably because the window position/size can be in a malformed state.

thread 'main' panicked at 'assertion failed: min <= max', /rustc/897e37553bba8b42751c67658967889d11ecd120\library\core\src\num\f32.rs:1394:9
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/897e37553bba8b42751c67658967889d11ecd120/library\std\src\panicking.rs:584
   1: core::panicking::panic_fmt
             at /rustc/897e37553bba8b42751c67658967889d11ecd120/library\core\src\panicking.rs:142
   2: core::panicking::panic
             at /rustc/897e37553bba8b42751c67658967889d11ecd120/library\core\src\panicking.rs:48
   3: core::f32::impl$0::clamp
             at /rustc/897e37553bba8b42751c67658967889d11ecd120\library\core\src\num\f32.rs:1394
   4: emath::pos2::Pos2::clamp
             at .\crates\emath\src\pos2.rs:188
   5: egui_winit::window_settings::WindowSettings::clamp_window_to_sane_position<enum2$<eframe::native::run::UserEvent> >
             at .\crates\egui-winit\src\window_settings.rs:132

To Reproduce
Steps to reproduce the behavior:

1. Build the egui demo app on windows

Desktop (please complete the following information):

• OS: Windows 11
• Version 0.21 - master

Additional context

[aevyrie]

The assertion is triggering because the RHS of the clamp is smaller than the LHS.