FIX: errors should not HALT to the console but QUIT to the system

Fixes issue #2215.

It is just a small modification, where in case of script error, the script QUITs instead of HALTing in REPL console. When `system/options/quiet = FALSE`, than there is 3s delay, before automatic quit. During this time user may use CTRL-C to HALT and enter the REPL for in place debugging.

When used `--halt` option, it enters the REPL as it was before without any wait. (Don't know if it is the best way, but I'm not sure if a new option is really needed for forcing REPL in case of errors).

src/os/host-main.c

@@ -311,6 +311,9 @@ int main(int argc, char **argv) {
 			|| (Main_Args.options & RO_HALT)  // --halt option
 		)
 	){
+		if (n < 0 && !(Main_Args.options & RO_HALT)) {
+			RL_Do_String(b_cast("unless system/options/quiet [print {^[[mClosing in 3s!} wait 3] quit/return -1"), 0, 0);
+		}
 		Host_Repl();
 	}