Some generated links in the blog module lack the .aspx suffix

## Describe the bug
I upgraded both DNN and the Blog Module. I am currently on a test site.

When I start with the list of posts, and click one to view its detail, the link is (for example) https://local.woottonbassettvbc.co.uk/News/Blogs/tabid/184/Post/1145/The-Ankle - this link gives a 404.
If I manually add .aspx to the end making https://local.woottonbassettvbc.co.uk/News/Blogs/tabid/184/Post/1145/The-Ankle.aspx then the link takes me to the expected detail.

The .aspx suffix is normal for pages on this site.

This sounds exactly like #95 which has no documented resolution.

## Software Versions
- DNN: 9.1.1 (upgraded from 7.4.1)
- Module: 6.4.1 (upgraded from 3.5.1)

Upgrade path - I could not get a direct upgrade from DNN 7.4.1/Blog 3.5.1 to work. I found that this sequence at least worked:

- Blog to 4.0.0
- Blog to 6.2.1 (at this point the need to manually add the .aspx suffix appeared)
- Site to DNN 9.1.1
- Blog to 6.4.1

## To Reproduce

I don't have a known repro. This is not a confidential site, I could make a backup of the site files and DB available. They are pretty big.

## Expected behavior

I expected the generated links to have a trailing .aspx so conforming to the pattern of the rest of the site.