Fix gridster width setting in responsive mode
Fix gridster width setting in responsive mode

* needs to use 100% instead of 100vw because the container may be smaller than the viewport width

luke-browning/gridster.js,Firewall/gridster.js,Firewall/gridster.js,M0nter0/gridster.js,dsmorse/gridster.js,emartech/gridster.js,dsmorse/gridster.js,M0nter0/gridster.js,emartech/gridster.js,emartech/gridster.js,stenverbois/gridster.js,stenverbois/gridster.js,stenverbois/gridster.js,luke-browning/gridster.js,Firewall/gridster.js,zeroedin-bill/gridster.js,zeroedin-bill/gridster.js,dsmorse/gridster.js,M0nter0/gridster.js,zeroedin-bill/gridster.js,luke-browning/gridster.js