MDEV-19111 Unused field INFORMATION_SCHEMA.INNODB_TABLESPACES_SCRUBBING.ROTATING_OR_FLUSHING

The MDEV-11738/MDEV-11581 fix was supposed to add the column
ROTATING_OR_FLUSHING to the INFORMATION_SCHEMA table
INNODB_TABLESPACES_ENCRYPTION, but it also added that column to
INNODB_TABLESPACES_SCRUBBING in InnoDB (not XtraDB).

The extra column was never initialized. We will remove it,
because key rotation has nothing to do with the scrubbing of
tablespace data.

storage/innobase/handler/i_s.cc

@@ -8506,15 +8506,6 @@ static ST_FIELD_INFO	innodb_tablespaces_scrubbing_fields_info[] =
 	 STRUCT_FLD(old_name,		""),
 	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
 
-#define TABLESPACES_ENCRYPTION_ROTATING_OR_FLUSHING 9
-	{STRUCT_FLD(field_name,		"ROTATING_OR_FLUSHING"),
-	 STRUCT_FLD(field_length,	MY_INT32_NUM_DECIMAL_DIGITS),
-	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
-	 STRUCT_FLD(value,		0),
-	 STRUCT_FLD(field_flags,	MY_I_S_UNSIGNED),
-	 STRUCT_FLD(old_name,		""),
-	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
-
 	END_OF_ST_FIELD_INFO
 };