Fix flexbox wrapping when a max main size style is present #2273

Job	Run time
Test Suite [std + block)]	1m 58s
Rustfmt	15s
Test Suite [alloc + all algorithms]	1m 29s
Build [debug feature]	7s
Test Suite [default features]	1m 30s
Test Suite [default except content_size]	1m 55s
Test Suite [default + serde]	1m 34s
Test Suite [std + flexbox]	1m 44s
Test Suite [alloc + no algorithms]	1m 40s
Test Suite [std + grid]	1m 28s
MSRV Build [Rust 1.65]	1m 51s
Test Suite [std (no algorithms)]	1m 37s
Test Suite [no features]	1m 32s
Build Benchmarks	36s
Build Benchmarks (w/ yoga)	44s
Clippy	32s
Documentation	27s
Test Fixture Formatting	8s
Markdown Lint	3s
	21m 10s

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