Don't create a double stack frame when calling aliases

The old code created a new stack frame in parse_line_alias_special(), then
another one in parse_line().  This prevented $functioncall() from working,
and made the output of CALL look odd.

|Rain| mentioned this years ago in starman.irc.

Changelog

@@ -1,5 +1,7 @@
 [Changes 1.2.2]
 
+* Fix $functioncall() scripting function (reported by |Rain|). (caf)
+
 * Ensure close_server() clears the internal command queues for the right
   server. (caf)
 

source/alias.c

@@ -1917,7 +1917,7 @@ char *	parse_line_alias_special (char *name, char *what, char *args, int d1, int
 	window_display = old_window_display;
 
 	will_catch_return_exceptions++;
-	parse_line(NULL, what, args, d1, d2, 1);
+	parse_line(NULL, what, args, d1, d2, 0);
 	will_catch_return_exceptions--;
 	return_exception = 0;