Optimize TPSWatcher

SpigotCore_Main/src/de/steamwar/core/TPSWatcher.java

@@ -77,7 +77,7 @@ public class TPSWatcher {
         LAST_TEN_SECONDS(10),
         LAST_THIRTY_SECONDS(30);
 
-        private int count;
+        private final int count;
 
         TpsAverage(int count) {
             this.count = count;