Fix 2D BatchedInstanceBuffer clear #40373

Job	Run time
build (windows-latest)	3m 27s
check-cfg	56s
check-doc	8m 11s
check-bevy-internal-imports	4s
check-missing-examples-in-docs	35s
ci	1m 48s
miri	5m 26s
build (ubuntu-latest)	2m 11s
run-examples-macos-metal	4m 52s
build (macos-latest)	3m 57s
toml	1m 59s
typos	8s
check-missing-features-in-docs	28s
markdownlint	1m 10s
check-compiles	2m 56s
msrv	50s
build-wasm-atomics	1m 13s
build-wasm	39s
	40m 50s

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