Fix calculation of `auto-fill`/`auto-fit` repetition count when conta… #2352

Job	Run time
Build Benchmarks (w/ yoga)	1m 13s
Documentation	51s
Clippy	1m 26s
Build Benchmarks	58s
Test Fixture Formatting	39s
Rustfmt	16s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	2m 7s
Test Suite [std + block)]	2m 6s
Build [debug feature]	40s
Test Suite [default features]	1m 55s
Test Suite [default except content_size]	1m 57s
Test Suite [default + serde]	1m 58s
Test Suite [std + flexbox]	2m 1s
Test Suite [std + grid]	2m 6s
Test Suite [alloc + no algorithms]	2m 3s
MSRV Build [Rust 1.65]	1m 38s
Test Suite [std (no algorithms)]	1m 58s
Test Suite [no features]	2m 5s
	28m 0s

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