Let Handlebars encode the mfrUrl query string

[jamescdavis]

Purpose

Fix issue where share url query string is double encoded

Summary of Changes

Remove encodeURIComponent() on file download url

Side Effects / Testing Notes

Make sure share link is valid

Ticket

N/A

Reviewer Checklist

• meets requirements
• easy to understand
• DRY
• testable and includes test(s)
• changes described in CHANGELOG.md

[aaxelb]

Minor: It's not a SHARE link, just a share link. No need to shout. 😄

[jamescdavis]

Weird. Muscle memory?

[jamescdavis]

Passing build: https://travis-ci.org/jamescdavis/ember-osf-web/builds/356904203

[coveralls]

Coverage remained the same at 21.122% when pulling 2254d18 on jamescdavis:no-double-encode-mfr-url into 27d7833 on CenterForOpenScience:develop.