Linphone: Hide local SIP account, hide video call button

edit ~/.config/linphone/linphonerc and add:

[ui]
show_local_sip_account=0
show_start_video_button=0
show_start_chat_button=0

Hiding SIP account works with linphone 4.2.5. Hiding video + chat buttons works with 4.3.0.

• https://github.com/BelledonneCommunications/linphone-desktop/commit/384bd0675aac21d6c732bab311d37cea914d639c
• https://linphone.org/news/ldap-search-feature-available-linphone-desktop