nixos/tests/misc: call the tester test to be callTest-ed

Otherwise, this will destroy the release machinery to collect all the
systems.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

nixos/tests/misc.nix

@@ -9,7 +9,10 @@ let
   };
 
   testsForPackage = args: lib.recurseIntoAttrs {
-    miscFeatures = testMiscFeatures args;
+    # If the attribute is not named 'test'
+    # You will break all the universe on the release-*.nix side of things.
+    # `discoverTests` relies on `test` existence to perform a `callTest`.
+    test = testMiscFeatures args;
     passthru.override = args': testsForPackage (args // args');
   };