Tables: Fix rendering of row bg and line separators (#3293, broken by fixes #3163, code was accidently relying on SetCurrentChannel not updating rectangle)
Tables: Fix rendering of row bg and line separators (#3293, broken by fixes #3163, code was accidently relying on SetCurrentChannel not updating rectangle)

+ Used shortcut in PushTableBackground/PopTableBackground

bkaradzic/imgui,Flix01/imgui,bkaradzic/imgui,nProtect/imgui,ocornut/imgui,ggtucker/imgui,Flix01/imgui,ocornut/imgui,nProtect/imgui,Flix01/imgui,bkaradzic/imgui,ocornut/imgui,ggtucker/imgui,ggtucker/imgui,nProtect/imgui