Move full_design and full_last into struct battery_info.
Move full_design and full_last into struct battery_info.

This is in preparation for moving the ratio computation code out of
slurp_battery_info to support aggregating multiple batteries.

ixjlyons/i3status,flammi/i3status,i3/i3status,flammi/i3status,Gravemind/i3status,lbonn/i3status,lexszero/i3status,peder2tm/i3status-netdev,ixjlyons/i3status,lbonn/i3status,ixjlyons/i3status,Watcom/i3status,Dettorer/i3status,Watcom/i3status,Gravemind/i3status,i3/i3status,flammi/i3status,Watcom/i3status,jasperla/i3status,lexszero/i3status,i3/i3status,jasperla/i3status,Dettorer/i3status,peder2tm/i3status-netdev,lbonn/i3status,lbonn/i3status,flammi/i3status,jasperla/i3status,lexszero/i3status,Gravemind/i3status,lexszero/i3status,Gravemind/i3status,ixjlyons/i3status,Watcom/i3status,jasperla/i3status,Dettorer/i3status,Dettorer/i3status,peder2tm/i3status-netdev,peder2tm/i3status-netdev,i3/i3status