how to remove header, i just want the bottom part like normal dialog.

- [x] I have verified there are no duplicate active or recent bugs, questions, or requests.
- [x] I have verified that I am using the latest version of MaterialStyledDialogs.
- [x] I have given my issue a non-generic title.
- [x] I have read over the [README](https://github.com/javiersantos/MaterialStyledDialogs/blob/master/README.md) and [Wiki](https://github.com/javiersantos/MaterialStyledDialogs/wiki) (before asking questions on how to do something).

###### Details
- MaterialStyledDialogs version: `2.x.x`
- Device OS version: `7.1.2`
- Device Manufacturer: `LG`
- Device Name: `Nexus 5X`

###### Reproduction Steps

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###### Expected Result

###### Actual Result

Start with the README and Wiki linked in the issue, looking for the dialog header configuration and any documented way to hide it. Confirm whether removing the header is already supported or requires a library change; done means the requested bottom-only dialog behavior is clearly documented or reproducibly supported.

Written by the indexing model from the issue text.