player/main: don't set the main thread name

98a27b3cd1 changed this to mpv but that's
kind of pointless since the binary is already named mpv so that will be
the default thread name. Evidently, people rename/symlink the binary to
something else so might as well make them happier. Fixes #13469.

player/main.c

@@ -419,7 +419,6 @@ int mp_initialize(struct MPContext *mpctx, char **options)
 
 int mpv_main(int argc, char *argv[])
 {
-    mp_thread_set_name("mpv");
     struct MPContext *mpctx = mp_create();
     if (!mpctx)
         return 1;