Wrong permissions used in Voice Circuit list view templates

[moises-perez-tfs]

These files have a small typo in the way they check for permissions:

• phonebox_plugin/templates/phonebox_plugin/voice_circuit_list_view_3.4.html
• phonebox_plugin/templates/phonebox_plugin/voice_circuit_list_view_3.x.html

And they check for perms.phonebox_plugin.add_voice_circuit instead of perms.phonebox_plugin.add_voicecircuit.