treewide: editorconfig fixes

- remove trailing whitespace
- use spaces for indentation

pkgs/development/libraries/snack/default.nix

@@ -23,10 +23,10 @@ stdenv.mkDerivation {
 
   installPhase = ''
     mkdir -p $out
-    make install DESTDIR="$out" 
+    make install DESTDIR="$out"
   '';
 
-  meta = { 
+  meta = {
     description = "The Snack Sound Toolkit (Tcl)";
     homepage = "http://www.speech.kth.se/snack/";
     license = stdenv.lib.licenses.gpl2;