Fix undeclared variable $difference (#1563)
Fix undeclared variable $difference (#1563)

Fixes a bug when returning nicetime
tomzx/blog.tomrochette.com,tomzx/blog.tomrochette.com,notklaatu/grav,getgrav/grav,Vivalldi/grav,tomzx/blog.tomrochette.com,notklaatu/grav,joeyhenricks/a-broke-vegan,joeyhenricks/a-broke-vegan,tomzx/blog.tomrochette.com,stell/grav,dimayakovlev/grav,Vivalldi/grav,webuxr/iamrs,getgrav/grav,dimayakovlev/grav