[REVIEW-3-6] [REVIEW-3-6-0] Revised "Document as Email" icon

[Stefan Knorr]

Hi there,

some people (everyone who commented on that issue so far) found the new
paper plane icon for Send Document as Email confusing.

Thus, I've pushed a more conventional icon to master. Please review for
3.6 and (if it isn't too late for 3.6.0).

The relevant commit is here:
http://cgit.freedesktop.org/libreoffice/core/commit/?id=9b773bfd59d3717d85ff14fd04123f3ea66fc3bf

Thanks!

Astron.