Made the remaining types from bevy_ui to reflect the Default trait if… #1660

Job	Run time
ci	2m 56s
check-doc	6m 52s
build (windows-latest)	7m 8s
check-bevy-internal-imports	4s
build (ubuntu-latest)	3m 3s
check-missing-examples-in-docs	30s
build (macos-latest)	10m 44s
miri	7m 19s
run-examples-on-windows-dx12	15m 25s
toml	6s
check-missing-features-in-docs	27s
markdownlint	1m 9s
check-compiles	3m 49s
msrv	1m 25s
build-wasm	1m 15s
	1h 2m 12s

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