nixos/mopidy: fix Python dependency collisions between extensions

Fixes #297539.

Author: jwillikers

nixos/modules/services/audio/mopidy.nix

@@ -12,6 +12,7 @@ let
 
   mopidyEnv = buildEnv {
     name = "mopidy-with-extensions-${mopidy.version}";
+    ignoreCollisions = true;
     paths = closePropagation cfg.extensionPackages;
     pathsToLink = [ "/${mopidyPackages.python.sitePackages}" ];
     nativeBuildInputs = [ makeWrapper ];