Remove reference to WAGTAILIMAGES_BACKENDS
Remove reference to WAGTAILIMAGES_BACKENDS

zerolab/wagtail,kaedroho/wagtail,zerolab/wagtail,wagtail/wagtail,wagtail/wagtail,mikedingjan/wagtail,thenewguy/wagtail,timorieber/wagtail,rsalmaso/wagtail,torchbox/wagtail,zerolab/wagtail,jnns/wagtail,gasman/wagtail,zerolab/wagtail,mixxorz/wagtail,torchbox/wagtail,nimasmi/wagtail,nimasmi/wagtail,mixxorz/wagtail,torchbox/wagtail,kaedroho/wagtail,gasman/wagtail,FlipperPA/wagtail,takeflight/wagtail,gasman/wagtail,timorieber/wagtail,mixxorz/wagtail,timorieber/wagtail,jnns/wagtail,jnns/wagtail,jnns/wagtail,takeflight/wagtail,kaedroho/wagtail,kaedroho/wagtail,mixxorz/wagtail,timorieber/wagtail,rsalmaso/wagtail,mixxorz/wagtail,nealtodd/wagtail,mikedingjan/wagtail,FlipperPA/wagtail,wagtail/wagtail,rsalmaso/wagtail,thenewguy/wagtail,wagtail/wagtail,torchbox/wagtail,rsalmaso/wagtail,nealtodd/wagtail,thenewguy/wagtail,takeflight/wagtail,wagtail/wagtail,FlipperPA/wagtail,nealtodd/wagtail,takeflight/wagtail,gasman/wagtail,mikedingjan/wagtail,mikedingjan/wagtail,FlipperPA/wagtail,nimasmi/wagtail,thenewguy/wagtail,gasman/wagtail,nimasmi/wagtail,zerolab/wagtail,rsalmaso/wagtail,kaedroho/wagtail,thenewguy/wagtail,nealtodd/wagtail