pngpaste: fix issue where file named bin was created

Author: guylamar2006

pkgs/by-name/pn/pngpaste/package.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   installPhase = ''
     runHook preInstall
-    install -Dm555 pngpaste $out/bin
+    install -Dm555 pngpaste $out/bin/pngpaste
     runHook postInstall
   '';