Install.sh places lua file in incorrect directory on OSX

[hossimo]

The configuration path for OSX have seemed to changed from ~/.wireshark/plugins/ to ~/.config/wireshark/plugins.

The path can easily be changed however the documentation does not include paths for OSX:

• /usr/share/wireshark/plugins
• /usr/local/share/wireshark/plugins
• $HOME/.wireshark/plugins

Trying to ask for confirmation but ask.wireshark.org doesnt seem to be sending validation emails. for the short term I'll just change the script. to include the new path for OSX and probably add the Linux paths while I'm at it.

[hossimo]

updated script in e662d45