Withings weight entries need to be fixed

[visheshd]

From slack:

I think the precision on the ounces is pretty absurd We should probably 
round those somehow in the display. Also yes, there seems to be something weird there 
--- @visheshd why is the base weight 24 lbs? That should be total weight.

[9:25] 
the fat-free should come after in the priority order

[9:26] 
Also I noticed fat mass and weight are the same, which is suspicious

[9:26] 
it should really be:

[9:27] 
total weight, fat weight, that’s it. No need to have “fat free” and no need to duplicate 
fields. It might be simpler to just break it into two tags instead of 
having a multidimensional tag since we’re grouping withings data 
together anyway now.

[9:27] 
Also since we have fat ratio it’s kind of redundant to also have fat weight