Add extra food rations to the Monk quest home level

The previous commit makes things somewhat harder for vegetarian
characters. Normally, making a conduct harder isn't a huge issue,
but vegetarian Monk is an intended/encouraged combination. As such,
compensate by adding some additional food rations to Monk games
specifically; the Quest home level is early enough to provide the
extra food, and as the level is Monk-specific, it will provide the
food only to Monks specifically.  (Although the Quest generally
requires level 14 to enter, the Quest home level specifically
doesn't.)

dat/Mon-strt.lua

@@ -104,3 +104,5 @@ end
 -- next to leader, so possibly tricky to pick up if not ready for quest yet;
 -- there's no protection against a xorn eating these tins; BUC state is random
 des.object({ id="tin", coord = {29, 9}, quantity=2, montype="spinach" })
+-- ensure enough vegetarian food generates for vegetarian games
+des.object({ id="food ration", coord = {46, 4}, quantity = 4})