Fix #763: Revert "Fix #759" (makes nnn hang when used in a script)

This reverts commit c074572748.

src/nnn.c

@@ -7854,10 +7854,6 @@ int main(int argc, char *argv[])
 	if (sort)
 		set_sort_flags(sort);
 
-	/* Set the process group to current process */
-	setpgid(0, 0);
-	tcsetpgrp(STDOUT_FILENO, getpid());
-
 	opt = browse(initpath, session, pkey);
 
 #ifndef NOMOUSE