[lexical] Chore: Enable all selection tests on Mac

[etrepum]

Description

Some selection tests were disabled on Mac, possibly for some legacy reason (maybe before the meta/ctrl key press in tests was abstracted?), but they all work because we have keybindings for each of the actions they are performing.

Test plan

Before

Fewer selection tests ran on Mac

After

All selection tests run on Mac

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 16, 2024 0:45am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 16, 2024 0:45am

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.94 KB (0%)
lexical - esm	29.78 KB (0%)
@lexical/rich-text - cjs	38.51 KB (0%)
@lexical/rich-text - esm	31.58 KB (0%)
@lexical/plain-text - cjs	37.16 KB (0%)
@lexical/plain-text - esm	29 KB (0%)
@lexical/react - cjs	40.29 KB (0%)
@lexical/react - esm	33 KB (0%)

[etrepum]

The logic here was inverted, the tests are skipped when NOT on mac. I don't have an easy way to test that so I am abandoning this PR.