Fix permission flags on all the log files created

[Torxed]

• This fix issue Password of secondary encrypted partitions shown in /var/log/archinstall/install.log (be mindful of posting the log until v2.4.2) #1062

PR Description:

Technically, the issue is already fixed in the huge re-work of the partitioning menu.
But while verifying I decided to clean up the permissions on the different files.

This should ensure that if user configuration files are copied, that they don't carry with them insecure read permissions.
I left the install.log with global read on purpose as the file is meant for debug purposes and should never contain sensitive information. If or when it does, it in of itself should be considered a security issue and be resolved. Changing permissions on the file won't change much when the real issue is when users post it - which they can and will anyway.

Tests and Checks

• I have tested the code!