securityonion-menu: add icon for NetworkMiner and update Exec

[dougburks]

From Erik Hjelmvik:

I noticed one thing. You probably wanna add the "--noupdatecheck" argument to the Exec line in
/usr/share/applications/securityonion-networkminer.desktop

Also, is there any chance you might exchange the security-onion.ico for this one in securityonion-networkminer.desktop?
https://www.netresec.com/files/networkminericon.ico

https://groups.google.com/d/topic/security-onion-testing/ZgVkgB2tcJY/discussion

[dougburks]

Submitted for testing:
https://groups.google.com/d/topic/security-onion-testing/nWfcuTUctNY/discussion

[dougburks]

Published:
https://blog.securityonion.net/2018/08/securityonion-menu-20121026.html