fix donate redirect

[TimidRobot]

Fixes

Fixes #1191 by @zackkrida

Description

fix donation redirect (do not URL escape destination)

Tests

change is live on server and verified:

http -h https://creativecommons.org/donate

HTTP/1.1 301 Moved Permanently
Age: 0
CF-Cache-Status: DYNAMIC
CF-RAY: 5fc60873d8fe35fe-LAX
Connection: keep-alive
Content-Type: text/html; charset=iso-8859-1
Date: Fri, 04 Dec 2020 13:56:50 GMT
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
Location: https://classy.org/give/313412/#!/donation/checkout
Server: cloudflare
Set-Cookie: __cfduid=dedb953acd15aaf0288b3a750ae91c5921607090209; expires=Sun, 03-Jan-21 13:56:49 GMT; path=/; domain=.creativecommons.org; HttpOnly; SameSite=Lax
Strict-Transport-Security: max-age=15768000
Transfer-Encoding: chunked
Via: 1.1 varnish (Varnish/5.0)
X-Content-Type-Options: nosniff
X-Frame-Options: deny
X-Varnish: 363353892
X-XSS-Protection: 1; mode=block
cf-request-id: 06cfa39c69000035fe18999000000001

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[mathemancer]

Looks good!