Add box-shadow to .progress-bar (#22579)
Add box-shadow to .progress-bar (#22579)

* Add box-shadow to .progress-bar

Puts an unused variable back in use for when folks set `$enable-shadows` to `true`.

inway/bootstrap,tibo66/bootstrap,yuyokk/bootstrap,zalog/bootstrap,janseliger/bootstrap,yuyokk/bootstrap,tagliala/bootstrap,tjkohli/bootstrap,hebbet/bootstrap,SweetProcess/bootstrap,janseliger/bootstrap,lemuelbarango/bootstrap,Scoutski/bootstrap,seanwu99/bootstrap,johnajacob/bootstrap,afuno/bootstrap,peterblazejewicz/bootstrap,peterblazejewicz/bootstrap,tagliala/bootstrap,andresgalante/bootstrap,tibo66/bootstrap,kvlsrg/bootstrap,fschumann1211/bootstrap,Lyricalz/bootstrap,vsn4ik/bootstrap,SweetProcess/bootstrap,johnajacob/bootstrap,inway/bootstrap,afuno/bootstrap,seanwu99/bootstrap,lemuelbarango/bootstrap,lipis/bootstrap,andresgalante/bootstrap,inway/bootstrap,m5o/bootstrap,NCARB/bootstrap,vsn4ik/bootstrap,igoynawamreh/bootstrap,TheFridayInstitute/bootstrap,andresgalante/bootstrap,Lyricalz/bootstrap,davethegr8/bootstrap,bardiharborow/bootstrap,kvlsrg/bootstrap,yuyokk/bootstrap,GerHobbelt/bootstrap,supergibbs/bootstrap,janseliger/bootstrap,janseliger/bootstrap,jipexu/bootstrap,bootstrapbrasil/bootstrap,stanwmusic/bootstrap,igoynawamreh/bootstrap,tibo66/bootstrap,Scoutski/bootstrap,TheFridayInstitute/bootstrap,9-chirno/chirno,Lyricalz/bootstrap,peterblazejewicz/bootstrap,Hemphill/bootstrap-docs,m5o/bootstrap,tagliala/bootstrap,andresgalante/bootstrap,Scoutski/bootstrap,vsn4ik/bootstrap,stanwmusic/bootstrap,SweetProcess/bootstrap,lemuelbarango/bootstrap,johnajacob/bootstrap,igoynawamreh/bootstrap,igoynawamreh/bootstrap,coliff/bootstrap,creativewebjp/bootstrap,kvlsrg/bootstrap,stanwmusic/bootstrap,bardiharborow/bootstrap,9-chirno/chirno,realcrowd/bootstrap,nice-fungal/bootstrap,NCARB/bootstrap,bardiharborow/bootstrap,Delagen/bootstrap,supergibbs/bootstrap,Delagen/bootstrap,SweetProcess/bootstrap,stanwmusic/bootstrap,tibo66/bootstrap,gijsbotje/bootstrap,creativewebjp/bootstrap,twbs/bootstrap,zalog/bootstrap,hebbet/bootstrap,Lyricalz/bootstrap,fschumann1211/bootstrap,fschumann1211/bootstrap,realcrowd/bootstrap,gijsbotje/bootstrap,afuno/bootstrap,jipexu/bootstrap,Delagen/bootstrap,davethegr8/bootstrap,hebbet/bootstrap,lipis/bootstrap,9-chirno/chirno,lipis/bootstrap,TheFridayInstitute/bootstrap,lemuelbarango/bootstrap,nice-fungal/bootstrap,twbs/bootstrap,joblocal/bootstrap,vsn4ik/bootstrap,bootstrapbrasil/bootstrap,xt0rted/bootstrap,joblocal/bootstrap,GerHobbelt/bootstrap,nice-fungal/bootstrap,coliff/bootstrap,bardiharborow/bootstrap,yuyokk/bootstrap,xt0rted/bootstrap,creativewebjp/bootstrap,tjkohli/bootstrap,9-chirno/chirno,zalog/bootstrap,gijsbotje/bootstrap,Scoutski/bootstrap,Hemphill/bootstrap-docs,supergibbs/bootstrap,davethegr8/bootstrap,creativewebjp/bootstrap,gijsbotje/bootstrap,GerHobbelt/bootstrap,xt0rted/bootstrap,Hemphill/bootstrap-docs,TheFridayInstitute/bootstrap,jipexu/bootstrap,realcrowd/bootstrap,afuno/bootstrap,Hemphill/bootstrap-docs,seanwu99/bootstrap,lipis/bootstrap,seanwu99/bootstrap,johnajacob/bootstrap,davethegr8/bootstrap,fschumann1211/bootstrap,realcrowd/bootstrap,joblocal/bootstrap,NCARB/bootstrap,bootstrapbrasil/bootstrap,jipexu/bootstrap,joblocal/bootstrap,xt0rted/bootstrap,Delagen/bootstrap,NCARB/bootstrap,hebbet/bootstrap,supergibbs/bootstrap