[Revert] Reverts Ninja (#15516)

* Revert "[Antag] add space ninja as midround antag (#14069)"

This reverts commit c1cda0dbf8.

* Revert "[Fix] move ninja objectives into NinjaRole (#15490)"

This reverts commit 251f429fb3.

Content.Shared/Interaction/SharedInteractionSystem.cs

@@ -449,6 +449,7 @@ namespace Content.Shared.Interaction
             // Have to be on same map regardless.
             if (other.MapId != origin.MapId)
                 return false;
+
             var dir = other.Position - origin.Position;
             var length = dir.Length;