[jsroot] fix TStyle handling when drawing TCanvas
[jsroot] fix TStyle handling when drawing TCanvas

root-mirror/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,karies/root,karies/root,karies/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,karies/root,olifre/root,olifre/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,karies/root