fetchFromBitbucket: url escape rev attr

To make sure revision with spaces in them (most likely from repos that
were used with mercurial) as well as revisions with names containing url
encoded characters ("branch%20with%20encoded%spaces").

pkgs/build-support/fetchbitbucket/default.nix

@@ -11,8 +11,7 @@ lib.makeOverridable (
   fetchzip (
     {
       inherit name;
-      url = "https://bitbucket.org/${owner}/${repo}/get/${rev}.tar.gz";
-      # url = "https://bitbucket.org/${owner}/${repo}/get/${lib.strings.escapeURL rev}.tar.gz";
+      url = "https://bitbucket.org/${owner}/${repo}/get/${lib.strings.escapeURL rev}.tar.gz";
       meta.homepage = "https://bitbucket.org/${owner}/${repo}/";
     }
     // removeAttrs args [