Simplify defeat backend

engine/Sim.lua

@@ -620,7 +620,7 @@ end
 
 --- Gets the current game time in ticks.
 --- The game time is the simulation time, that stops when the game is paused.
----@return number
+---@return integer
 function GetGameTick()
 end
 

lua/SimSync.lua

@@ -166,7 +166,7 @@ function FloatingEntityText(entityId, text)
 end
 
 function StartCountdown(entityId, duration)
-    cdDuration = duration or 5
+    local cdDuration = duration or 5
     if not entityId then
         WARN('Trying to start countdown text with no entityId.')
         return false