Werk #15722: omd update: Fix setting world read permissions on etc and local files

Starting with 2.2.0 (see #15062), we use a umask of 0077 to prevent files and directories owned by the site user from being world readable. However, when updating from the CRE to a non CRE edition, some files and directories were still set to be world readable during 'omd update'. This is now in line with the other files.

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