Style engine: refer to 'context' rather than 'store' in global function

[ramonjd]

What?

Renames user-facing method wp_style_engine_get_stylesheet_from_store to wp_style_engine_get_stylesheet_from_context since it matches the incoming option parameter 'context'

Props to @noisysocks for the nudge

Why?

So that the fetching method matches the context option.

Also, the assumption is that 'store' is not meaningful on its own.

	// Register block supports styles.
	wp_style_engine_get_styles(
		$block_styles,
		array(
			'selector' => ".$class_name",
			'context'  => 'block-supports', // context!!!
		)
	);

	// Fetch block supports styles from context store.
	$styles = wp_style_engine_get_stylesheet_from_context( 'block-supports' );

Testing Instructions

The tests should pass.

[aristath]

LGTM! 👍