Input[type='date'] transformed to type='text' on blur

### Expected behavior
Date input should remain with type='date' after blur event.

### Actual behavior
Date input is transformed to type='text' after blur event.

### Your working environment and MDB version information
jQuery 3.3.1
Bootstrap 4.4.1
MDB 4.16.0

### Resources (screenshots, code snippets etc.)
Caused by ChangeDateInputType in forms-free module.

