[alias-server] Add quotes to make error log less ambiguous

Summary:
T3060

Depends on D14127

Can be confusing to see error log of "Error finding alias test in database". Compare 'Error finding alias "test" in database'

Test Plan: npm test, confirm change is just to error log

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D14129