provision/docker: fix variable name
provision/docker: fix variable name

It was a type, it's the resize, and not the start URL.

ggarnier/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,4eek/tsuru,hcxiong/tsuru,Endika/tsuru,jblancett/tsuru,ggarnier/tsuru,ggarnier/tsuru,kgrvamsi/tsuru,tsuru/tsuru,hcxiong/tsuru,Endika/tsuru,tuxmonteiro/tsuru,gwmoura/tsuru,cgvarela/tsuru,cezarsa/tsuru,cgvarela/tsuru,gwmoura/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,RichardKnop/tsuru,ggarnier/tsuru,kgrvamsi/tsuru,ArxdSilva/tsuru,RichardKnop/tsuru,guilhermebr/tsuru,jblancett/tsuru,gciotta/tsuru,ArxdSilva/tsuru,RichardKnop/tsuru,cezarsa/tsuru,guilhermebr/tsuru,tsuru/tsuru,tsuru/tsuru,gwmoura/tsuru,firebitsbr/tsuru,gciotta/tsuru,mderaldo/tsuru,tuxmonteiro/tsuru,gciotta/tsuru,guilhermebr/tsuru,mderaldo/tsuru,kgrvamsi/tsuru,tsuru/tsuru,mderaldo/tsuru,firebitsbr/tsuru,4eek/tsuru,Endika/tsuru,tuxmonteiro/tsuru,jblancett/tsuru,hcxiong/tsuru,cgvarela/tsuru,4eek/tsuru,firebitsbr/tsuru