testing/hledger-web: create home directory
hledger-web will now create the journal file, i.e. /var/lib/hledger/.hledger.journal, when it's first started. This is what users of the hledger-web-openrc service would expect.
Context: I recently installed hledger-web-openrc service on a new
machine and found it out to be missing due to -H
.