fix config option for fall-protection messages

missilewars-plugin/src/main/java/de/butzlabben/missilewars/wrapper/abstracts/arena/FallProtectionConfiguration.java

@@ -18,7 +18,6 @@
 
 package de.butzlabben.missilewars.wrapper.abstracts.arena;
 
-
 import com.google.gson.annotations.SerializedName;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
@@ -31,5 +30,5 @@ public class FallProtectionConfiguration {
 
     private final boolean enabled = true;
     private final int duration = 60;
-    @SerializedName("message_only_on_start") private final boolean messageOnlyOnStart = false;
+    @SerializedName("message_only_on_start") private boolean messageOnlyOnStart = false;
 }