Added a tooltip to clarify what default/not default
means when selecting networking.
Proposed tooltip:
"default ([name])" denotes system-wide default - if the default is changed in Global Settings, the networking qube will change.
If you want to keep using a given networking qube regardless of system settings, select "[name]".
references QubesOS/qubes-issues#2211
references QubesOS/qubes-issues#3567