fix: invisible url when only a protocol

[styfle]

• Fixes Bare URLs ending in a colon become invisible when rendered as a facet #1058

[DavidBuchanan314]

I'm not sure about this strategy. If I made the following post, expressed in markdown syntax:

I'm going to see [Spider-Man: Into the Spiderverse](https://www.imdb.com/title/tt4633694/) in the cinema

(use your imagination for the corresponding facets)

Then this post would get rendered as:

I'm going to see Into the Spiderverse in the cinema

When it really ought to be:

I'm going to see Spider-Man: Into the Spiderverse in the cinema

[styfle]

@DavidBuchanan314 Good point! I updated in 91fae09 to include your suggestion.

[pfrazee]

Looks good, thanks folks!