BBBModal: allow `noFooter: false` to hide existent footer

[Arthurk12]

Is your feature request related to a problem? Please describe.
Currently, the footer is displayed if noFooter is false or if there is a valid contentFooter element. So in this scenario, a BBBModal being rendered with a valid contentFooter element and with noFooter true will DISPLAY the footer, which is a bit confusing.

Describe the solution you'd like
Allow noFooter: true to actually hide the footer section even if there is a valid contentFooter element.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Affected component(s)
BBBModal

Proposed API / Usage Example
If applicable, provide a code snippet showing how the feature would be used.

// should display en empty footer section
<BBBModal
  title="My modal example"
/>

// should display the footer section
<BBBModal
  title="My modal example"
  footerContent={<BBButton label="Cancel" />}
/>

// should NOT display the footer section
<BBBModal
  title="My modal example"
  noFooter
/>

// should NOT display the footer section
<BBBModal
  title="My modal example"
  noFooter
  footerContent={<BBButton label="Cancel" />}
/>