[Battery plasmoid] do not show vendor and product, always show battery details

Summary:
Retry after D23237
Vendor and Product will be shown in the energy information kcm after D23152

Test Plan:
After:

Reviewers: VDG, Plasma, broulik, ngraham

Reviewed By: VDG, Plasma, broulik, ngraham

Subscribers: ngraham, alexde, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D23260