Fix: errors when wasm32 is targeted.

[johanmontorfano]

There were compilation issues when target is wasm32-unknown-unknown due to:

• Window::set_inner_size being used while not being defined instead of Window::request_inner_size
• window.canvas() not being unwrapped before being Intoed
• wasm-bindgen wasn't set as a feature of instant but is required for instant to compile to wasm

There were unreachable code due to misspellings of feature in comfy-wgpu.