Fix touch events not working for wasm builds

Pull in a winit patch to fix touch event positions to be relative to the
HTML canvas element.

Author: tronical

Cargo.toml

@@ -92,3 +92,6 @@ panic = "abort"
 [profile.dev]
 panic = "abort"
 
+[patch.crates-io]
+# Pull in https://github.com/rust-windowing/winit/pull/2704
+winit = { git = "https://github.com/slint-ui/winit", branch = "simon/touch-event-position" }