Use define for player name length in botl

This defines the cut-off how many characters of the player's name
is shown in the bottom status line.
Also increase the limit from 10 characters to 16.

include/botl.h

@@ -27,6 +27,9 @@ Astral Plane \GXXXXNNNN:123456 HP:1234(1234) Pw:1234(1234) AC:-127
 #define MAXCO (COLNO + 40)
 #endif
 
+/* limit of the player's name in the status window */
+#define BOTL_NSIZ 16
+
 struct condmap {
     const char *id;
     unsigned long bitmask;