Remove custom paragraph options for media-text

[koke]

This will make the content part behave like the regular block appender

Fixes wordpress-mobile/gutenberg-mobile#1531

Note that I also removed the default fontSize: large since we are currently not displaying/supporting font sizes, and it could lead to unexpected surprises when publishing the content.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[pinarol]

WPAndroid: Everything works as expected.

WPiOS:

I've spotted an interesting issue where the first text input inside media-text starts with lowercase:

When we remove its contents and type something again it starts to work as expected:

Any ideas why this could be happening?

[koke]

I've spotted an interesting issue where the first text input inside media-text starts with lowercase:

That's being fixed in wordpress-mobile/gutenberg-mobile#1552 😅

[pinarol]

Thanks for the clarification @koke Let's