Fix default value for left/right margins.
Fix default value for left/right margins.

alexanderfrankel/axlsx,clarkcutler/axlsx,sh-ft/axlsx,raghavendra-prithvi/axlsx,randym/axlsx,VueOps/axlsx,mromulus/axlsx,woto/axlsx,bookmate/axlsx,cloudbi/axlsx,sr-education/axlsx,bradstewart/axlsx,romuloceccon/axlsx,nilbus/axlsx,kappiah/axlsx,legitscript/axlsx,pedrogarrett/axlsx,Debiancc/axlsx