glocalfileinfo: don't special-case directory icons
glocalfileinfo: don't special-case directory icons

As of e6af432, g_content_type_get_symbolic_icon() returns non-symbolic
fallbacks. Thus, we can't append another symbolic icon to the fallbacks.

The special case was a bit of a hack anyway. It was only applied to
themed icons and there was no generic fallback for mime types that are
not folders.

https://bugzilla.gnome.org/show_bug.cgi?id=726046

tamaskenez/glib,mzabaluev/glib,johne53/MB3Glib,MathieuDuponchelle/glib,tchakabam/glib,lukasz-skalski/glib,lukasz-skalski/glib,tchakabam/glib,ieei/glib,ieei/glib,ieei/glib,cention-sany/glib,mzabaluev/glib,Distrotech/glib,lukasz-skalski/glib,tchakabam/glib,endlessm/glib,MathieuDuponchelle/glib,gale320/glib,endlessm/glib,MathieuDuponchelle/glib,johne53/MB3Glib,lukasz-skalski/glib,mzabaluev/glib,tchakabam/glib,ieei/glib,krichter722/glib,johne53/MB3Glib,cention-sany/glib,cention-sany/glib,ieei/glib,cention-sany/glib,krichter722/glib,tamaskenez/glib,johne53/MB3Glib,krichter722/glib,johne53/MB3Glib,krichter722/glib,Distrotech/glib,gale320/glib,endlessm/glib,gale320/glib,endlessm/glib,cention-sany/glib,gale320/glib,Distrotech/glib,tamaskenez/glib,gale320/glib,lukasz-skalski/glib,Distrotech/glib,mzabaluev/glib,tamaskenez/glib,MathieuDuponchelle/glib,tamaskenez/glib,tchakabam/glib,johne53/MB3Glib,endlessm/glib,MathieuDuponchelle/glib,Distrotech/glib,krichter722/glib,mzabaluev/glib