Fix keysAccessor by making it an interface.

common/src/main/java/fr/username404/snowygui/mixins/keysAccessor.java

@@ -7,7 +7,7 @@ import org.spongepowered.asm.mixin.gen.Accessor;
 import java.util.Map;
 
 @Mixin(KeyMapping.class)
-public class keysAccessor {
+public interface keysAccessor {
 	@Accessor("CATEGORY_SORT_ORDER")
 	static Map<String, Integer> getSortedCategoryMap() { throw new AssertionError(); }
 }