Write subtitle names as utf-8 byte stream to stdout

non ascii characters seem to conflict with lua/mpv when writing the
filename to stdout, which leads to failure in loading the subtitle. This
fixes that.

subselect.py

@@ -88,7 +88,7 @@ class subselect :
             title = video.name + ".srt"
         s = save_subtitles(video, [subtitle], True, save_dir)
         if s != [] :
-            print(title, end="")
+            sys.stdout.buffer.write(title.encode("utf-8"))
             self.root.destroy()
         else :
             self.show_message("Download failed", "Subtitle download failed!")