core::unicode: Replace Cased table with Lt

[Jules-Bertholet]

Shaves off 368 bytes from the total size of all Unicode data tables.

@rustbot label A-unicode

[rustbot]

library/core/src/unicode/unicode_data.rs is generated by the src/tools/unicode-table-generator tool.

If you want to modify unicode_data.rs, please modify the tool then regenerate the library source file via ./x run src/tools/unicode-table-generator instead of editing unicode_data.rs manually.

[rustbot]

r? @scottmcm

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