Update/Fix .macos and custom.macos High Sierra issues

[adrw]

<|b [ custom.macos ] ***********************************************************
Set: Entry, ":FK_StandardViewSettings:IconViewSettings:gridSpacing", Does Not Exist
Set: Entry, ":FK_StandardViewSettings:IconViewSettings:iconSize", Does Not Exist
Done. Note that some of these changes require a logout/restart to take effect.
ok: [ custom.macos ] ***********************************************************

<|b [ .macos ] *****************************************************************
2018-08-24 13:44:08.930 defaults[30567:735709] 
Rep argument is not a dictionary
Defaults have not been changed.
/Users/me/.files/scripts/.macos: line 27: /System/Library/CoreServices/Menu Extras/Volume.menu: is a directory
Set: Entry, ":FK_StandardViewSettings:IconViewSettings:showItemInfo", Does Not Exist
Set: Entry, ":FK_StandardViewSettings:IconViewSettings:arrangeBy", Does Not Exist
disablelocal: Unrecognized verb.
Done. Note that some of these changes require a logout/restart to take effect.