mime_types: rename to mime-types

pkgs/top-level/all-packages.nix

···
 
   shaderc = callPackage ../development/compilers/shaderc { };
 
-  mime_types = callPackage ../data/misc/mime-types { };
+  mime-types = callPackage ../data/misc/mime-types { };
 
   shared_mime_info = callPackage ../data/misc/shared-mime-info { };