fix(#2744): Toast fade fix with display block

[davidlyons]

• Bug fix
• New feature
• Chore
• Breaking change
• There is an open issue which this change addresses
• I have read the CONTRIBUTING document.
• My commits follow the Git Commit Guidelines
• My code follows the code style of this project.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
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  • I have updated the typings accordingly.
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• All new and existing tests passed.

Boostrap has a .toast style that breaks Reactstrap's Toast fade transition.
This PR overrides the Toast's display: none with the d-block utility class to fix the fade transition.

Fix for #2744

[illiteratewriter]

@davidlyons Great catch on finding what was causing the issue.

The PR kind of fixes the issue but this is causing Reactstrap to behave differently from how Bootstrap is behaving right now. Ideally, we would like to have the same behaviour that Bootstrap is providing.