Removed web-sys from bevy_window, never used (#6414)

# Objective

Noticed bevy_window doesn't ever use web-sys.
That logic resides to bevy_winit and winit.

## Solution

Remove web-sys dependency

crates/bevy_window/Cargo.toml

@@ -25,6 +25,3 @@ raw-window-handle = "0.5"
 
 # other
 serde = { version = "1.0", features = ["derive"], optional = true }
-
-[target.'cfg(target_arch = "wasm32")'.dependencies]
-web-sys = "0.3"