It seems that custom pages don't work when put in templates/pages

To reproduce on datasette version 0.59.4 using PowerShell on WIndows 10 with Python 3.10.0

mkdir -p templates/pages

echo "hello world" >> templates/pages/about.html

Start datasette

datasette --template-dir templates/

Navigate to http://127.0.0.1:8001/about and receive:

Error 404:
Database not found: about