Fix emoji search using keyboard language instead of system language

[anperez]

Reverts a change to InputSources.swift introduced in 4fabc33 that made emoji search depend on the current keyboard layout (e.g., Spanish), rather than the system language (e.g., English).

This restores the previous behavior by using currentAppInputSource().uniqueElements instead of currentKeyboardLanguage(), ensuring emoji search results align with the system language preferences.

This should fix #1200

EDIT: ⚠️ Closed accidentally while sync'ing branches. Re-opened as #1301 ⚠️

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1 out of 3 committers have signed the CLA.

✅ anperez
❌ Mike Renoir
❌ overtake

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[rojnwa]

@overtake could we give this some love please?

[jonathanlundstrom]

@overtake can we please get this PR rebased/merged to baseline for the next release? It makes my life a living hell 🤕

[jonathanlundstrom]

Ping @overtake could we please merge this? 😭