BP user blogs count display in user nav not classed.

[hnla]

The user navs display counts in spans on various nav tabs e.g notifications, these span elements are classed either as 'no-count' or 'count'.

The Sites tab link has never had these classes added to it's span count.

This patch corrects this for uniformity.

@lead-devs please check this as I had to cast bp_get_total_blog_count_for_user as an '(int)' as in replicating other examples of how we do this a strict comparison is used but that failed on my re-working originally I used a < 1 as a check but wanted to mirror how the others handled it but 0=== failed when it shouldn't have, tracking the function back wasn't clear what the value being passed was. As it's a clear count it seemed appropriate to cast it to an int and it's use doesn't move outside the scope it's used in here.

[johnjamesjacoby]

Good fix for 2.3. Let's get this in early.

[johnjamesjacoby]

In 9531:

Blogs: Update main-nav text to include classes, to match other similar components. Props hnla. Fixes #6207.