restore default.test, default.result after MDEV-23597 c47e4aab commit

mysql-test/r/default.result

@@ -3089,8 +3089,8 @@ DROP TABLE t1;
 #
 # Collations
 #
-CREATE TABLE t1 (a VARCHAR(20) CHARACTER SET latin1 DEFAULT CONCAT('�')) CHARACTER SET koi8r COLLATE koi8r_bin;
-ERROR 22007: Encountered illegal value '�' when converting to koi8r
+CREATE TABLE t1 (a VARCHAR(20) CHARACTER SET latin1 DEFAULT CONCAT('')) CHARACTER SET koi8r COLLATE koi8r_bin;
+ERROR 22007: Encountered illegal value '' when converting to koi8r
 CREATE OR REPLACE TABLE t1 (a char(2) default concat('A') COLLATE utf8mb4_unicode_ci);
 SHOW CREATE TABLE t1;
 Table	Create Table

mysql-test/t/default.test

@@ -1855,7 +1855,7 @@ DROP TABLE t1;
 --echo #
 
 --error ER_BAD_DATA
-CREATE TABLE t1 (a VARCHAR(20) CHARACTER SET latin1 DEFAULT CONCAT('�')) CHARACTER SET koi8r COLLATE koi8r_bin;
+CREATE TABLE t1 (a VARCHAR(20) CHARACTER SET latin1 DEFAULT CONCAT('')) CHARACTER SET koi8r COLLATE koi8r_bin;
 CREATE OR REPLACE TABLE t1 (a char(2) default concat('A') COLLATE utf8mb4_unicode_ci);
 SHOW CREATE TABLE t1;
 DROP TABLE t1;