Fix primary group not loading and Vault support with EssentialsChat

common/src/main/java/me/lucko/luckperms/data/methods/FlatfileDatastore.java

@@ -161,7 +161,7 @@ public class FlatfileDatastore extends Datastore {
             reader.nextName(); // name record
             reader.nextString(); // name
             reader.nextName(); // primaryGroup record
-            reader.nextString(); // primaryGroup
+            user.setPrimaryGroup(reader.nextString()); // primaryGroup
             reader.nextName(); //perms
             reader.beginObject();
             while (reader.hasNext()) {

common/src/main/java/me/lucko/luckperms/data/methods/SQLDatastore.java

@@ -184,6 +184,7 @@ abstract class SQLDatastore extends Datastore {
                     });
                 } else {
                     user.getNodes().putAll(gson.fromJson(resultSet.getString("perms"), NM_TYPE));
+                    user.setPrimaryGroup(resultSet.getString("primary_group"));
                 }
                 return success;
             }