Re-write bug for curation-rewards and author-rewards link

[ng-gist]

Expected behavior

When re-write link feature is enable in busy settings, only valid busy links should get changed from steemit.com to busy.org.

Actual behavior

Some of steemit.com links show page not found when re-written as busy.org.

How to reproduce

1. Create a post with following valid steemit.com link:

• Curation Rewards - https://steemit.com/@mightypanda/curation-rewards
• Author Rewards - https://steemit.com/@mightypanda/author-rewards

2. Go into Settings page on busy.org and enable Re-write links
   
3. Go to the post that you created with the steem link and click on the links. You will be redirected to "Page Not Found"

Example Post to reproduce the bug

https://busy.org/@fastandcurious/testing-some-issue-don-t-mind-me

• Browser: Chrome Version 69.0.3497.100 (Official Build) (64-bit)
• Operating system: OSX 10.11.6

[economicstudio]

In general, this should be handled by relative url. PR #2144 resolves this.