tests: fix i18n.sh regression test on arm64

Georgia Garcia requested to merge georgiag/apparmor:fix-i18n-test into master

The following errors are happening on the regression tests of i18n.sh on arm64 hirsute/impish:

Error: open failed. Test 'i18n (194) OPEN (octal) "/tmp/sdtest.3654-6536-J2ZwFM/file__post" RW' was expected to 'pass'. Reason for failure 'FAIL: open /tmp/sdtest.3654-6536-J2ZwFM/file__post failed - Permission denied'

The cause is a bash bug handling UTF-8 on subshells.

Fixes: https://bugs.launchpad.net/apparmor/+bug/1932331

Signed-off-by: Georgia Garcia georgia.garcia@canonical.com

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