Remove UNIQUE on gravity table as the only column is already PRIMARY KEY. Primary keys must contain UNIQUE values, and cannot contain NULL values

Signed-off-by: DL6ER <dl6er@dl6er.de>

advanced/Templates/gravity.db.sql

@@ -36,7 +36,7 @@ CREATE TABLE adlists
 );
 CREATE TABLE gravity
 (
-	domain TEXT UNIQUE PRIMARY KEY
+	domain TEXT PRIMARY KEY
 );
 CREATE TABLE info
 (