Commit 250e9fadbc introduced
support for %j/%J specifier in unit files. The function
unit_name_printf is used in unit dependency resolution,
such as Wants / After directives, but was missing support
for the %j. Add to allow directives such as:
[Unit]
Wants=bar-%j.target
Fixes: systemd/systemd#11217
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>