nixos/tests/avahi: Fix evaluation

In commit a61ca0373b (#100267), the avahi
test expression got an additional attribute, but instead of wrapping the
function, the attributes were introduced by nesting the function one
level deeper.

To illustrate this:

  Before: attrs: <testdrv>
  After:  newattrs: attrs: <testdrv>

So when instantiating tests.avahi.x86_64-linux from nixos/release.nix we
get "value is a function while a set was expected" instead of the
derivation.

I simply re-passed the attributes to make-test-python.nix, since the
function already allows (via "...") arbitrary attributes to be passed.

The reason why I'm pushing this directly to master is because evaluation
for the test is already broken and the worst that could happen here is
that things are *still* broken.

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @flokli, @doronbehar

nixos/tests/avahi.nix

@@ -2,10 +2,11 @@
 , config ? {}
 , pkgs ? import ../.. { inherit system config; }
 # bool: whether to use networkd in the tests
-, networkd ? false }:
+, networkd ? false
+} @ args:
 
 # Test whether `avahi-daemon' and `libnss-mdns' work as expected.
-import ./make-test-python.nix ({ ... } : {
+import ./make-test-python.nix {
   name = "avahi";
   meta = with pkgs.stdenv.lib.maintainers; {
     maintainers = [ eelco ];
@@ -75,4 +76,4 @@ import ./make-test-python.nix ({ ... } : {
     two.succeed("avahi-browse -r -t _ssh._tcp | tee out >&2")
     two.succeed("test `wc -l < out` -gt 0")
   '';
-})
+} args