whitespace change to fix k2pdfopt build

(cherry picked from commit 896036d8e5ec2ad35e74fc43da3d6305ef43b253)
Signed-off-by: Domen Kožar <[e-mail]>

pkgs/applications/misc/k2pdfopt/default.nix

···
             -ljbig2dec -ljpeg -lopenjp2 -lpng -lfreetype -lpthread -lmujs \
             -lPgm2asc -llept -ltesseract -lcrypto
 
-    mkdir -p $out/bin
+    mkdir -p $out/bin 
     cp k2pdfopt $out/bin
   '';