fix: ae/oe chars being registered as two mistakes when mistyped (@thedev0ps)

[thedev0ps]

Description

Remove the ae/oe character check which makes it register as seperate characters of the next character is not ae/oe, causing two mistakes instead of one.

Checks

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Closes #6482

[thedev0ps]

This PR also fixes the issue where a and e are highlighted instead of æ on the keymap when the layout and keymap are danish qwerty