Packaging scripts set 0755 on MaxScale config, data and log directories on every install/upgrade making it world readable

Maxscale 25.10.4-1, RPM and DEB packages' `postinst` scripts set the following directories to `0755` permission on every install and upgrade:

/var/log/maxscale

/var/lib/maxscale

/etc/maxscale.modules.d

/etc/maxscale.cnf.d

A customer's internal security policy requires `0750` on these paths. Since the `postinst` script unconditionally resets permissions to `0755` on every install/upgrade, they are forced to manually reapply `0750` each time, and their security monitoring tools raise alarms in between.

Setting the permission of directories to world-readable seems to cause security issues.

Lines 10-15:

# Change the owner of the directories to maxscale:maxscale

for path in "/var/log/maxscale" "/var/lib/maxscale" "/etc/maxscale.modules.d" "/etc/maxscale.cnf.d"

do

   chown -R maxscale:maxscale "$path"

   chmod 0755 "$path"

done

Requesting feasibility review of setting `0750` as the default in the install scripts, so customers do not need to apply this manually after every install/upgrade.