Revert "Set Escape delay to 0"

An ESCDELAY of 0 can break long escape sequences, such as the arrow keys,
on slower terminals.

This reverts commit 2599564e64.

src/nnn.c

@@ -1714,7 +1714,7 @@ static bool initcurses(void *oldmask)
 	}
 
 	settimeout(); /* One second */
-	set_escdelay(0);
+	set_escdelay(25);
 	return TRUE;
 }