Register right function for SQLite

Author: bahusoid

src/NHibernate/Dialect/SQLiteDialect.cs

@@ -110,6 +110,7 @@ protected virtual void RegisterFunctions()
 
 			RegisterFunction("substring", new StandardSQLFunction("substr", NHibernateUtil.String));
 			RegisterFunction("left", new SQLFunctionTemplate(NHibernateUtil.String, "substr(?1,1,?2)"));
+			RegisterFunction("right", new SQLFunctionTemplate(NHibernateUtil.String, "substr(?1,-?2)"));
 			RegisterFunction("trim", new AnsiTrimEmulationFunction());
 			RegisterFunction("replace", new StandardSafeSQLFunction("replace", NHibernateUtil.String, 3));
 			RegisterFunction("chr", new StandardSQLFunction("char", NHibernateUtil.Character));