minor cleanups

- btcpayserver: remove unneeded trailing semicolons

- krops/get-sha256:
  `tail` is unneeded because `nix-prefetch-url` just outputs a single
  line containing the hash.

pkgs/krops/get-sha256.sh

@@ -5,7 +5,7 @@ set -euo pipefail
 archive_hash () {
     repo=$1
     rev=$2
-    nix-prefetch-url --unpack "https://github.com/${repo}/archive/${rev}.tar.gz" 2> /dev/null | tail -n 1
+    nix-prefetch-url --unpack "https://github.com/${repo}/archive/${rev}.tar.gz" 2> /dev/null
 }
 
 echo "Fetching latest krops commit"