wireguard-go: remove injections of custom shortVer

Due to the previous changes, shortVer is no longer custom at all.
It is just equal to the official version number, so the custom
injections became essentially no-ops.

pkgs/by-name/wi/wireguard-go/package.nix

@@ -10,7 +10,6 @@ buildGoModule (
   finalAttrs:
   let
     version = "0.0.20250522";
-    shortVer = version;
   in
   {
     pname = "wireguard-go";
@@ -24,9 +23,6 @@ buildGoModule (
     postPatch = ''
       # Skip formatting tests
       rm -f format_test.go
-
-      # Inject version
-      printf 'package main\n\nconst Version = "${shortVer}"' > version.go
     '';
 
     vendorHash = "sha256-sCajxTV26jjlmgmbV4GG6hg9NkLGS773ZbFyKucvuBE=";
@@ -56,7 +52,7 @@ buildGoModule (
 
     passthru.tests.version = testers.testVersion {
       package = wireguard-go;
-      version = "v${shortVer}";
+      version = "v${version}";
     };
 
     meta = with lib; {