remove angles from email address if From: field

[csantosb]

When I set

(setq message-from-style 'angles) 

the From: field appears as

My Name <my.name@address.com>

In this case, the function mu4e-multi-smtpmail-set-msmtp-account doesn't find the right account in the .msmtprc file. This pr removes the angles from the email address.

[kriyative]

I can confirm that this pull request will fix the issue. Would be great if you could merge it.

Thanks for publishing mu4e-multi, it's really useful.

[kriyative]

Hi @fgallina - any issue with merging this PR? ... I don't think there's any downside to merging it, please let me know if otherwise. Thanks.