Revert "[ttx_diff] Only report size issues if fontc > fontmake" #2883

Job	Run time
cargo check no std	1m 31s
Build GS and check the result	3m 16s
resources/scripts/ots_test.sh	1m 12s
Rustfmt	1m 11s
Clippy lints	1m 47s
cargo test fea-rs	1m 33s
fontbe tests	1m 3s
fontc tests	1m 17s
tests other than fontbe,fontc	2m 15s
	15m 5s

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