column 'author_ip' in table '#__jem_venues' too short for IPv6

[Wolfgang-Chess]

https://www.joomlaeventmanager.net/forum/bugs/12411-error-when-saving-a-venue#30659

Same kind of issue as in #1607

(I do not have triage access here in in this Github project, so I cannot label it 'J4'... - I am the JEM moderator "Wolfgang".)

[Heklaterriol]

Fixed, see #1607