Show expiration time in server's local time

[x1uc]

Resolves #641

Related PR: #644

The above PR has largely addressed the corresponding issue, but there is one missing part. This PR completes the missing part.

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[x1uc]

I have read the CLA Document and I hereby sign the CLA

[mtlynch]

LGTM, thanks!

Just a small process note, the better way to continue changes someone else began on a git project is to preserve their commits. This PR dropped 55e8813 from the change history. It's not a big deal in this case because it's such a small change, but developers and maintainers will generally be happier if you preserve the commit history to show that others contributed to a PR.

Here's what that would have looked like here:

# Add my copy of picoshare (mtlynch/picoshare) as a git remote called "upstream"
git remote add upstream git@github.com:mtlynch/picoshare.git

# Get my work in progress branch
git checkout upstream/show-local-exp-time

# If you check git log at this point, 55e881 (my partial fix) should be the most recent change

# Create a new branch for your work
git checkout -b fix-e2e

# Make your additional changes to handlers/views.go
vim handlers/views.go

# Commit your changes
git add handlers/views.go
git commit --message "Repeat @mtlynch's e2e fix in one more spot"

# Push your changes
git push origin fix-e2e

# Make the PR