FR: allow not showing Unit on Badge

[Mariusthvdb]

several (core) integrations have odd units on particular entities, like

in the Ecowitt integration.

As it stands a badge now can not leave out that unit, (or manually adjust), so it looks really odd:

we can adjust the name to be a bit more to the point:

But in this case it would be best if we could leave out the Unit completely.

so please consider adding the option to

show_unit: false

and make it show like the same entity in the Tomorrow integration. (which has no unit at all....)