treewide: editorconfig fixes

- add final newline
- use spaces for indentation

pkgs/misc/base16-builder/node-packages-generated.nix

@@ -1634,4 +1634,4 @@ in
     bypassCache = true;
     reconstructLock = true;
   };
-}
+}

pkgs/misc/base16-builder/node-packages.nix

@@ -18,4 +18,4 @@ in
 import ./node-packages-generated.nix {
   inherit (pkgs) fetchurl fetchgit;
   inherit nodeEnv globalBuildInputs;
-}
+}

pkgs/misc/base16-builder/supplement.nix

@@ -690,4 +690,4 @@ in
     bypassCache = true;
     reconstructLock = true;
   };
-}
+}