ftplugin/mail.vim: Add a mapping to remove the last two lines

I have two empty lines below my signature to add some space between my
top-posted message and the quoted message of a reply below.

When I start a new mail message, though, nothing is below my message,
resulting in two empty lines at the bottom of my emails. Add a mapping
to quickly remove these lines to save me from having to do it manually.
Should save some time.

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