WASM: Create canvas before first window in resumed(). Fixes #2618 #2620
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This creates a canvas and inserts into the document body, and attaches it to the initial window in Runner::resumed(). This fixes an issue where events were being routed to a WindowId that was not inserted into the window manager as reported in #2618.
With this change, duplicate winit messages to the rogue WindowId are no longer observed, and ModifiersChanged events are associated with the correct WindowId.