Markdown tables do not preview correctly in the composer windows

[othomson]

Environment

Discourse Version: 2.7.0.beta1

Plugin Commit: 2681fe21adae1645dcac6aa0386524578e6185b8

Other Plugins
N/A

Steps to Reproduce

1. Create a wizard with a composer field, that uses the composer field contents to create a new topic.

2. Place the following markdown into the composer window:

   |Title A|TitleB|
   |---|---|
   |Value A|Value B|
   

3. Observe how the preview is formatted when the ‘Preview Post’ button is clicked.

4. Observe how the table is formatted different in the final post.

[angus]

@fzngagan Please handle this one when you get the time.

[fzngagan]

@othomson

FIX: table styles for wizard composer preview

I’ve just merged this in. This is how the tables look now.

[othomson]

Thanks!