Don't SetThreadName() in main()

On Linux, this changes the program name shown in top.

src/syncterm/syncterm.c

@@ -1527,7 +1527,6 @@ main(int argc, char **argv)
 	    "syncterm-60-w-bitmap|SyncTERM 132x60 No Status Line,\n"
 	    "\tcols#132,lines#60,use=syncterm-bitmap,\n";
 
-	SetThreadName("Main Thread");
 	if ((argc == 2) && (strcmp(argv[1], "-T") == 0)) {
 		write(STDOUT_FILENO, syncterm_termcap, strlen(syncterm_termcap));
 		return 0;