Twenty Thirteen: improve styling for RSS widget title

[aaroncampbell]

The RSS widget links it's title, so it doesn't look like it fits with the other widgets.

[sabreuse]

23571.diff styles linked widget titles to match the other widget titles. Links are still underlined on hover, so they're still discoverable as links.

[lancewillett]

@sabreuse Tiny thing with your patch -- can you put new selectors on a new line? We're following the WP CSS guidelines, see "Structure" here: ​http://make.wordpress.org/core/handbook/coding-standards/css/#structure.

Otherwise, the technique should work well and I can push the fix in.

[Mamaduka]

23571.2.diff​ Updates the patch to follow WP CSS guidelines, also uses better CSS selectors for widget titles as suggested in #23580.

[obenland]

Do we really want to have them in the same color? It's a link after all, the others aren't.

[aaroncampbell]

Replying to obenland:

Do we really want to have them in the same color? It's a link after all, the others aren't.

I prefer it to be the same color. I think it looks best. However, I'm open to another option but I think the RSS Widget header should be further differentiated from the links in the widget content.

Any suggestions?

[lancewillett]

I think it's fine if it's the same color. On hover it changes to denote a link.

[lancewillett]

In 23491:

Twenty Thirteen: improve styling for RSS widget title, fixes #23571.