wineserver: Do not uselessly set the KEY_DIRTY flag on registry keys when loading from file

[Paul Chitescu]

Changelog:
	wineserver: Do not uselessly set the KEY_DIRTY flag on registry keys when 
loading from file.

Explanations:
- load_keys() now strictly inherits the flags from the parent key, no longer 
makes dirty all non-volatile keys
- load_value() doesn't need to mark the key dirty, it should be so already
- load_registry() is always called on a key created dirty and when doing so 
create_key() calls internally make_dirty()
- load_init_registry_from_file() is called on keys created clean so all 
children are created initially clean

Supersedes "wineserver: Mark registry hives clean after being loaded initially 
from file"

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