Remove sensitivity option from Levenshtein function

src/res/levenshtein.sql

@@ -1,6 +1,6 @@
 DELIMITER $$
 DROP FUNCTION IF EXISTS levenshtein $$
-CREATE FUNCTION levenshtein( s1 VARCHAR(255), s2 VARCHAR(255), sensitivity INT )
+CREATE FUNCTION levenshtein( s1 VARCHAR(255), s2 VARCHAR(255) )
 RETURNS INT
 DETERMINISTIC
 BEGIN