Lintian complains about command-with-path

Lintian detects the command-with-path-in-maintainer-script on line 143
from the postinst script while it was previously on line 140. So this
override was no more working.

debian/mariadb-server-10.3.lintian-overrides

 # ash's buildin has no "-e" so use /bin/echo
-mariadb-server-10.3: command-with-path-in-maintainer-script postinst:140 /bin/echo
+mariadb-server-10.3: command-with-path-in-maintainer-script postinst:143 /bin/echo
 # OK, path /usr/sbin/invoke-rc.d is only used in check, executes are run without the path
 # False positive: unfortified calls have already been fully validated at compile-time
 # See full research at https://jira.mariadb.org/browse/MDEV-8377