MongoDataProvider update method doesn't use global toDb method #314

Describe the bug
MongoDataProvider update method doesn't use global toDb method

To Reproduce
Steps to reproduce the behavior:

1. Create new Entity with field like this:

@Fields.string({
  valueConverter: {
    fieldTypeInDb: 'dbid',
  },
})
institutionId!: string;

2. Insert new document from this entity
3. Update the dbid field
4. The dbid field saved as string

Expected behavior
The field should stay ObjectId

Screenshots