whitespace change to fix k2pdfopt build

(cherry picked from commit 896036d8e5)
Signed-off-by: Domen Kožar <domen@dev.si>

pkgs/applications/misc/k2pdfopt/default.nix

@@ -96,7 +96,7 @@ in stdenv.mkDerivation rec {
             -ljbig2dec -ljpeg -lopenjp2 -lpng -lfreetype -lpthread -lmujs \
             -lPgm2asc -llept -ltesseract -lcrypto
 
-    mkdir -p $out/bin
+    mkdir -p $out/bin 
     cp k2pdfopt $out/bin
   '';