mlt: fix binary not being wrapped if enableQt is disabled

Signed-off-by: lucasew <[e-mail]>

pkgs/development/libraries/mlt/default.nix

···
 , libsamplerate
 , libvorbis
 , libxml2
+, makeWrapper
 , movit
 , opencv4
 , rtaudio
···
     cmake
     pkg-config
     which
+    makeWrapper
   ] ++ lib.optionals cudaSupport [
     cudaPackages.cuda_nvcc
   ] ++ lib.optionals enablePython [
···
     "-DSWIG_PYTHON=ON"
   ];
 
-  qtWrapperArgs = [
-    "--prefix FREI0R_PATH : ${frei0r}/lib/frei0r-1"
-  ] ++ lib.optionals enableJackrack [
-    "--prefix LADSPA_PATH : ${ladspaPlugins}/lib/ladspa"
-  ];
+  preFixup = ''
+    wrapProgram $out/bin/melt \
+      --prefix FREI0R_PATH : ${frei0r}/lib/frei0r-1 \
+      ${lib.optionalString enableJackrack "--prefix LADSPA_PATH : ${ladspaPlugins}/lib/ladspa"} \
+      ${lib.optionalString enableQt "\${qtWrapperArgs[@]}"}
+
+  '';
 
   postFixup = ''
     substituteInPlace "$dev"/lib/pkgconfig/mlt-framework-7.pc \