Make the modal title styling consistent

[afercia]

The modal title has the following default styling:

The keyboard shortcut modal wraps the title in a <span> element, which is then styled with a bigger font size and bold font weight:

gutenberg/packages/edit-post/src/components/keyboard-shortcut-help-modal/index.js

Lines 72 to 75 in ee2d5c7

	const title = (
	<span className="edit-post-keyboard-shortcut-help__title">
	{ __( 'Keyboard Shortcuts' ) }
	</span>

If the styling with the bigger font size and bold font weight is preferred, I'd suggest to make it the default in the Modal component instead of overriding it on a case by case basis. This way, all the modals (even the ones added by plugins) will have the same styling.

[kjellr]

Agreed, the larger font size and bold text seem reasonable to use in all modals by default.