Fix #691: don't perform server tick on client-side.

Author: noobanidus

common/src/main/java/noobanidus/mods/lootr/common/entity/LootrChestMinecartEntity.java

@@ -116,7 +116,9 @@ public boolean isInvulnerableTo(DamageSource source) {
   @Override
   public void tick() {
     super.tick();
-    LootrAPI.handleProviderTick(this);
+    if (!this.level().isClientSide()) {
+      LootrAPI.handleProviderTick(this);
+    }
   }
 
   @Override