Fixed equal check between Island objects not checking for identical r…

…eferences

src/main/java/com/bgsoftware/superiorskyblock/island/SIsland.java

@@ -3510,7 +3510,7 @@ public int hashCode() {
 
     @Override
     public boolean equals(Object obj) {
-        return obj instanceof Island && this.uuid.equals(((Island) obj).getUniqueId());
+        return obj instanceof Island && (this == obj || this.uuid.equals(((Island) obj).getUniqueId()));
     }
 
     @Override