.osx: Copy email addresses as `foo@example.com` instead of `Foo Bar

This doesn’t work anymore in OS X 10.9:

``` bash
# Copy email addresses as `foo@example.com` instead of `Foo Bar ` in Mail.app
defaults write com.apple.mail AddressesIncludeNameOnPasteboard -bool false
```

Start with the Mail.app defaults command shown in the issue and verify its behavior on the affected macOS version. Research the current Mail.app pasteboard setting and determine whether a supported replacement exists; done means copying an address produces only foo@example.com rather than the display name and address.

Written by the indexing model from the issue text.