darwin-test-channel: I broke it a bit adding macos-sierra-shared

This doesn't completely unbreak it, but gets it closer.

pkgs/top-level/all-packages.nix

···
 
   xtermcontrol = callPackage ../applications/misc/xtermcontrol {};
 
-  # No `recurseIntoAttrs` because there's no need to nix-env these.
-  tests = {
+  # `recurseIntoAttrs` for sake of hydra, not nix-env
+  tests = recurseIntoAttrs {
     macOSSierraShared = callPackage ../test/macos-sierra-shared {};
   };
 }

pkgs/top-level/release.nix

···
               jobs.python.x86_64-darwin
               jobs.rustc.x86_64-darwin
               jobs.go.x86_64-darwin
-              jobs.tests.macOSSierraShared
+              jobs.tests.macOSSierraShared.x86_64-darwin
             ];
         };