To reduce noise in the "other accounts" field of hledger-ui's and
hledger-web's account register: if there are both real and virtual
postings to other accounts, show only the accounts posted to by real
postings.
Use case: in many transactions I have extra balanced-virtual postings
which adjust budget envelopes (subaccounts of checking). These clutter
up the register's other accounts field making it useless. Excluding them
(when there are also real postings) makes it more useful for me and
probably others.