reddit: show singular "comment" in post output when appropriate

[dgw]

Description

Just a grammar issue that's been annoying me for too long already. Tested with a very imaginative "random" Reddit submission ID, 123456 😼

Before (emphasis added):

[reddit] I'm thinking about getting a dog and YouTubed ways to train them. Then I came across this video (http://www.youtube.com/watch?v=b9upM4RbIeU&feature=g-vrec) to r/funny | 0 points (50.0%) | 1 comments | Posted by cocobunny | Created at Thursday, October 25, 2012 15:53:08 -0500

After (emphasis again added):

[reddit] I'm thinking about getting a dog and YouTubed ways to train them. Then I came across this video (http://www.youtube.com/watch?v=b9upM4RbIeU&feature=g-vrec) to r/funny | 0 points (50.0%) | 1 comment | Posted by cocobunny | Created at Thursday, October 25, 2012 15:53:08 -0500

Checklist

• I have read CONTRIBUTING.md
• I can and do license this contribution under the EFLv2
• No issues are reported by make qa (runs make quality and make test)
• I have tested the functionality of the things this change touches