go-ethereum: fix incorrect license

Cf. upstream at https://github.com/ethereum/go-ethereum/blob/master/README.md#license

Author: asymmetric

pkgs/by-name/go/go-ethereum/package.nix

@@ -72,8 +72,8 @@ buildGoModule rec {
     homepage = "https://geth.ethereum.org/";
     description = "Official golang implementation of the Ethereum protocol";
     license = with licenses; [
-      lgpl3Plus
-      gpl3Plus
+      lgpl3Only
+      gpl3Only
     ];
     maintainers = with maintainers; [ RaghavSood ];
     mainProgram = "geth";