plausible: move overrides to package.nix (#485678)

pkgs/by-name/pl/plausible/package.nix

@@ -1,6 +1,7 @@
 {
   lib,
-  beamPackages,
+  beam27Packages,
+  elixir_1_18,
   buildNpmPackage,
   rustPlatform,
   fetchFromGitHub,
@@ -111,6 +112,8 @@ let
         done
       '';
 
+  beamPackages = beam27Packages.extend (self: super: { elixir = elixir_1_18; });
+
 in
 beamPackages.mixRelease rec {
   inherit

pkgs/top-level/all-packages.nix

@@ -1519,10 +1519,6 @@ with pkgs;
     stdenv = clangStdenv;
   };
 
-  plausible = callPackage ../by-name/pl/plausible/package.nix {
-    beamPackages = beam27Packages.extend (self: super: { elixir = elixir_1_18; });
-  };
-
   reattach-to-user-namespace = callPackage ../os-specific/darwin/reattach-to-user-namespace { };
 
   xcodeenv = callPackage ../development/mobile/xcodeenv { };