services.exe: Reduce Registry access to KEY_READ or MAXIMUM_ALLOWED wherever possible (try 2)

[Paul Chitescu]

Changelog:
        services.exe: Reduce Registry access to KEY_READ or MAXIMUM_ALLOWED 
wherever possible

In many places reading the Registry is enough to work even when write access 
is denied.

Changes from previous attempt: change service config only if saving to 
Registry succeeds, use diff -p to create the patch.

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