fix(language): remove non-polish word

closes monkeytypegame#6120

Author: Miodec

frontend/static/languages/polish_2k.json

@@ -2039,7 +2039,6 @@
     "Bóg",
     "wybrać",
     "zjawisko",
-    "abugida",
     "według",
     "kara",
     "czas",