MythZoneMinder: fix the grabbing of the live stream images

* Add a missing field to the ShareData struct added it later ZM versions
* Change the minimum supported ZM version to 1.24.0.
* Remove the v4l2 hack

Note: this bumps the MythZoneMinder protocol version so both the FE plugin
and mythzmserver need to be updated.

Refs #8182

(cherry picked from commit b1867bd45765157432f5598aa26377fb922ed116)