Fix merge commit 5ea5291: No test file or result files should be executable

[ottok]

Description

In commit 5ea5291 @sanja-byelkin for unknown reason switched the file mode for 3 Galera tzinfo related test files from 644 -> 755. This exists only from branch 10.6 onward:

$ git checkout 10.5
$ find mysql-test -executable -name *.test -or -executable -name *.result
(no results)
$ git checkout 10.6
$ find mysql-test -executable -name *.test -or -executable -name *.result
mysql-test/suite/galera/t/mysql_tzmysql-test/suite/galera/t/mysql_tzinfo_to_sql.test
mysql-test/suite/galera/t/mariadb_tzinfo_to_sql.test
mysql-test/suite/galera/r/mariadb_tzinfo_to_sql.resultinfo_to_sql.test

mysql-test/suite/galera/t/mariadb_tzinfo_to_sql.test mysql-test/suite/galera/r/mariadb_tzinfo_to_sql.result

No test file nor test result file should be executable, so run chmod -x on them.

How can this PR be tested?

See commit message.

Basing the PR against the correct MariaDB version

• This is a bug fix and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

• I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• [no] For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.

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