Fix error_log complaint about Elongate info.json (#9262)

keyboards/acheron/elongate/info.json

@@ -63,7 +63,7 @@
                 {"label":"Down", "x":11.25, "y":3.25},
                 {"label":"Right", "x":12.25, "y":3.25},
                 {"label":"0", "x":13.5, "y":3},
-                {"label":".", "x":14.5, "y":3},
+                {"label":".", "x":14.5, "y":3}
             ]
         }
     }