Fix issues with bounty_score

* Set lower limit to bounty
* Check for div-by-0 before calculating bounty_score
* Rounded score after calculation
* Changed the divisor from 10000 to 5000 to prevent very tiny bounties on targets

mods/ctf_bounties/init.lua

@@ -26,13 +26,20 @@ local function bounty_player(target)
 
 	--                Score * K/D
 	-- bounty_score = -----------, or 500 (whichever is lesser)
-	--                   10000
+	--                   5000
 
 	local pstat, _ = ctf_stats.player(target)
+	if pstat.deaths == 0 then
+		pstat.deaths = 1
+	end
 	bounty_score = (pstat.score * (pstat.kills / pstat.deaths)) / 10000
 	if bounty_score > 500 then
 		bounty_score = 500
 	end
+	if bounty_score < 50 then
+		bounty_score = 50
+	end
+	bounty_score = math.floor(bounty_score)
 
 	minetest.after(0.1, announce_all)
 end