Fix combo tracking commands - remove load-time existence checks

The combotrack/comboclear commands were checking if functions existed at
file load time, but ComboPointTracker.lua loads after Core.lua, so the
checks always failed. Removed the checks since by runtime (when the user
executes the command) all files will be loaded and functions will exist.

Fixes "Combo point tracking not available" message.

Core.lua

@@ -3270,23 +3270,15 @@ SlashCmdList["CLEVEROID"] = function(msg)
 
     -- combotrack (show combo point tracking info)
     if cmd == "combotrack" or cmd == "combo" then
-        if CleveRoids.ShowComboTracking then
-            CleveRoids.ShowComboTracking()
-        else
-            CleveRoids.Print("Combo point tracking not available")
-        end
+        CleveRoids.ShowComboTracking()
         return
     end
 
     -- comboclear (clear combo tracking data)
     if cmd == "comboclear" then
-        if CleveRoids.ComboPointTracking then
-            CleveRoids.ComboPointTracking = {}
-            CleveRoids.ComboPointTracking.byID = {}
-            CleveRoids.Print("Combo point tracking data cleared")
-        else
-            CleveRoids.Print("Combo point tracking not available")
-        end
+        CleveRoids.ComboPointTracking = {}
+        CleveRoids.ComboPointTracking.byID = {}
+        CleveRoids.Print("Combo point tracking data cleared")
         return
     end