xilem_web: Fix todomvc example (items left in footer) #2371

Job	Run time
cargo check (msrv) (wasm32)	18s
cargo clippy (windows-latest)	5m 0s
cargo check (aarch64-android)	27s
cargo clippy (macos-latest)	2m 14s
cargo check (msrv) (windows-latest)	1m 36s
cargo check (msrv) (macos-latest)	34s
cargo clippy (ubuntu-latest)	3m 42s
cargo clippy (wasm32)	1m 59s
cargo check (msrv) (ubuntu-latest)	48s
formatting	31s
cargo doc	41s
Prime LFS Cache	18s
cargo test (wasm32)	21s
typos	3s
cargo test (windows-latest)	4m 17s
cargo test (macos-latest)	1m 30s
cargo test (ubuntu-latest)	4m 31s
	28m 50s

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