Feature request: Make the Mergeable column in the repositories view reflect pr_status

[dagheyman]

I was recently confused by the bors UI while trying to introduce a blocking condition using the pr_status field in bors.toml. Even though the logic was working correctly, and merging was in fact blocked because of the PR check, the PR was listed as "Mergeable" in the bors web UI. See picture:

I couldn't tell the pr_status check was working without actually trying to do bors r+, which correctly refused the merge.

Would it make sense to have the "Mergeable" column in the web UI reflect the status of pr_status checks? Alternatively, adding this information in a new column?