fix(export): stop counting letterbox rows as an upscale #679

Job	Run time
Type Check	44s
Lint	36s
Rust test (Linux compositor)	3m 54s
Test	1m 44s
Typecheck (tests)	50s
Docs	9s
Build	1m 5s
Rust test (macOS compositor)	1m 48s
Rust check (Windows compositor)	1m 35s
Validate PR title (semantic)	0s
	12m 25s

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