terraform: remove remove plugins from postInstall

hasn't been needed for a long time

also remove unneeded fetchpatch

pkgs/applications/networking/cluster/terraform/default.nix

@@ -8,7 +8,6 @@
 , runtimeShell
 , writeText
 , terraform-providers
-, fetchpatch
 , installShellFiles
 }:
 
@@ -38,13 +37,6 @@ let
       nativeBuildInputs = [ installShellFiles ];
 
       postInstall = ''
-        # remove all plugins, they are part of the main binary now
-        for i in $out/bin/*; do
-          if [[ $(basename $i) != terraform ]]; then
-            rm "$i"
-          fi
-        done
-
         # https://github.com/posener/complete/blob/9a4745ac49b29530e07dc2581745a218b646b7a3/cmd/install/bash.go#L8
         installShellCompletion --bash --name terraform <(echo complete -C terraform terraform)
       '';