Issues with upload files with complex names in Safari

[gerhard (Gerhard Schlager)]

@peternlewis

Discourse (my server is on 2.3.2)

I just commited a fix. You can give it a try by upgrading / switching to the tests-passed branch.

https://github.com/discourse/discourse/commit/24877a7b8c3aa445f0969b298ba8a34ac57c7bd6