[ttx_diff] Ignore lookup indices of normalized lookups #3285

Job	Run time
fontc tests	1m 17s
Clippy lints	1m 44s
cargo check no std	1m 37s
Rustfmt	1m 21s
resources/scripts/ots_test.sh	1m 4s
tests other than fontbe,fontc	2m 22s
Build GS and check the result	3m 24s
cargo test fea-rs	59s
cargo check wasm	1m 18s
Check if .glyphs files have unnecessary elements	3s
fontbe tests	1m 19s
	16m 28s

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