Add forum Open/Close Backend Row Actions

[netweb]

Include the ability to open and close forums via the backend forum admin row action links.

[johnjamesjacoby]

Looks good. A few things:

• Let's always use brackets goings forward, to match WordPress's updated code styling.
• Is 'moderate' the correct capability? I think forums are limited to 'keep_gate'
• We may want to avoid the long ternaries and use if/else blocks for the notice strings.

With those updates, let's commit this into 2.6.

[netweb]

Replying to johnjamesjacoby:

Let's always use brackets goings forward, to match WordPress's updated code styling.

My bad, I should have done that in the first place

Is 'moderate' the correct capability? I think forums are limited to 'keep_gate'

Yep, fixed, updated to keep_gate

We may want to avoid the long ternaries and use if/else blocks for the notice strings.

Avoid the what? Go's and googles 'ternaries', ah those things

Refreshes patch... in ​2491.2.diff fixes per above.

[netweb]

In 5254:

Include backend admin open and close forum row actions. Props netweb. Fixes #2491.