Don't print "low buzzing" for bee-less trees when kicked

Noticed this when testing a level with some barren trees which were set
in the special level to not contain bees; the barren trees are still
able to produce a low buzzing. This may convince players that they can
get bees from the tree if only they kick it enough times, which will not
happen.

To avoid that, only print this message when the tree can release bees,
augmenting the existing check for killer bees being non-extinct.

src/dokick.c

@@ -1137,7 +1137,9 @@ kick_nondoor(coordxy x, coordxy y, int avrg_attrib)
 
         /* nothing, fruit or trouble? 75:23.5:1.5% */
         if (rn2(3)) {
-            if (!rn2(6) && !(svm.mvitals[PM_KILLER_BEE].mvflags & G_GONE))
+            if (!rn2(6)
+                && !(svm.mvitals[PM_KILLER_BEE].mvflags & G_GONE)
+                && !(gm.maploc->looted & TREE_SWARM))
                 You_hear("a low buzzing."); /* a warning */
             kick_ouch(x, y, "");
             return ECMD_TIME;