Do not display vendor, Product and capacity in network plasmoid

Summary:
Those information mostly clutter the plasmoid UI and are not very useful in the energy plasmoid
The battery plasmoid represents the state of the battery, for battery information we have the Energy information KCM in kinfocenter that will display this after D23152 .

Test Plan:
Before:
{F7257309}
After:
{F7257310}

Reviewers: ngraham, #plasma, broulik, #vdg, filipf

Reviewed By: ngraham, #vdg, filipf

Subscribers: apol, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D23237