Add WRITE_DAC to ServiceAccess enum in service.rs

[codesavvysoftware]

Need this for a call to change a DACL where admins only have WRITE_DAC access.

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This change is 

[Legend-Master]

I think some other standard access rights are also missing, like READ_CONTROL for QueryServiceObjectSecurity, also generic access rights?

https://learn.microsoft.com/en-us/windows/win32/services/service-security-and-access-rights#access-rights-for-a-service

[faern]

This and more access flags have now been merged as part of #129