Handle negative value for SolutionView width

[martinrrm]

Bug

Fixes: NuGet/Home#13928

Description

If the user has a scaling/font size that affects the PM UI size and make it really small, this affects when we calculate the width of SolutionView, which with the new column it can make it a negative value

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• [] Added tests UI change, tests width different scaling and font size
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc.

[donnie-msft]

I appreciate you looking at this so quickly and talking with me about it, as we found the root cause quickly as one involving accessibility.

As I point out in the review comment, there may be more to change. I'm also wondering if we can reduce or eliminate some of this calculation.

My advice for a plan here is:

1. Talk to Vendors to see if DPI scaling is part of any testing. If so, we can ask them to help us validate that they can repro before this change, and do not repro after this change. /cc @nkolev92 for ideas there.

2. I'll follow-up by searching for similar accessibility bugs around ListView width and DPI scaling. We could engage the Accessibility team if we need more insight, but I'm not sure we do at this time.

3. Attempt to reduce the logic further, add tests, anything to simplify and guard against this going forward.

4. Get this change (or any addendums in step 3) inserted into VS.

[donnie-msft]

Merging per @aortiz-msft