Tweak styling for error message to be consistent with other form error styling in admin
Tweak styling for error message to be consistent with other form error styling in admin

mkllnk/openfoodnetwork,levent/openfoodnetwork,KosenkoDmitriy/openfoodnetwork,KosenkoDmitriy/openfoodnetwork,ltrls/openfoodnetwork,ecocitycore/openfoodnetwork,RohanM/openfoodnetwork,levent/openfoodnetwork,folklabs/openfoodnetwork,MikeiLL/openfoodnetwork,ecocitycore/openfoodnetwork,Matt-Yorkley/openfoodnetwork,KateDavis/openfoodnetwork,ecocitycore/openfoodnetwork,KateDavis/openfoodnetwork,ecocitycore/openfoodnetwork,KosenkoDmitriy/openfoodnetwork,ltrls/openfoodnetwork,RohanM/openfoodnetwork,folklabs/openfoodnetwork,KosenkoDmitriy/openfoodnetwork,Em-AK/openfoodnetwork,ltrls/openfoodnetwork,openfoodfoundation/openfoodnetwork,openfoodfoundation/openfoodnetwork,folklabs/openfoodnetwork,stveep/openfoodnetwork,KateDavis/openfoodnetwork,lin-d-hop/openfoodnetwork,MikeiLL/openfoodnetwork,KateDavis/openfoodnetwork,stveep/openfoodnetwork,oeoeaio/openfoodnetwork,oeoeaio/openfoodnetwork,MikeiLL/openfoodnetwork,Em-AK/openfoodnetwork,folklabs/openfoodnetwork,MikeiLL/openfoodnetwork,lin-d-hop/openfoodnetwork,ltrls/openfoodnetwork,lin-d-hop/openfoodnetwork,lin-d-hop/openfoodnetwork,mkllnk/openfoodnetwork,Em-AK/openfoodnetwork,RohanM/openfoodnetwork,openfoodfoundation/openfoodnetwork,openfoodfoundation/openfoodnetwork,oeoeaio/openfoodnetwork,RohanM/openfoodnetwork,Matt-Yorkley/openfoodnetwork,Em-AK/openfoodnetwork,Matt-Yorkley/openfoodnetwork,levent/openfoodnetwork,levent/openfoodnetwork,stveep/openfoodnetwork,mkllnk/openfoodnetwork,oeoeaio/openfoodnetwork,stveep/openfoodnetwork,Matt-Yorkley/openfoodnetwork,mkllnk/openfoodnetwork