fix: incorrect condiional check in Gutenberg_Token_Map_6_7::read_small_token()

[justlevine]

What?

This PR fixes an issue in Gutenberg_Token_Map_6_7::read_small_token() where a misplaced ) results in a strtoupper( {... text check logic ... }, causing the conditional to incorrectly handle case-insensitive checks.

Why?

While this issue was surfaced by PHPStan (via #66693) it can be remediated independently as part of #66598

How?

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

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Co-authored-by: justlevine <[email protected]>

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