Follow up of {5707}.

The reading order in the current beta version needs to be changed.
As remarked here (T5707#214465 ) the reading order for the settings should be:

• HKLM
• XDG_SYSTEM_DIRS
• HKCU
• XDG_CONFIG_DIRS

This way the global kleopatrarc we provide and install on every update can not override any settings in HKLM. (If instead XDG_SYSTEM_DIRS is read first, it can override the settings from HKLM with an immutable setting.)