Add additional checkstyle checks

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/event/entity/EntityTargetLivingEntityEvent.java

@@ -9,7 +9,7 @@ import org.jetbrains.annotations.Nullable;
  * Called when an Entity targets a {@link LivingEntity} and can only target
  * LivingEntity's.
  */
-public class EntityTargetLivingEntityEvent extends EntityTargetEvent{
+public class EntityTargetLivingEntityEvent extends EntityTargetEvent {
     public EntityTargetLivingEntityEvent(@NotNull final Entity entity, @Nullable final LivingEntity target, @Nullable final TargetReason reason) {
         super(entity, target, reason);
     }

paper-api/src/main/java/org/bukkit/event/entity/PlayerLeashEntityEvent.java

@@ -71,6 +71,6 @@ public class PlayerLeashEntityEvent extends Event implements Cancellable {
 
     @Override
     public void setCancelled(boolean cancel) {
-        this.cancelled  = cancel;
+        this.cancelled = cancel;
     }
 }