Update image size references

Where possible, use the newly registered image size. The original image
size will be available to call on for backup, for images uploaded prior
to WordPress 5.3.

includes/output/class-displayfeaturedimagegenesis-output.php

@@ -172,7 +172,7 @@ class Display_Featured_Image_Genesis_Output {
 		$image_id = displayfeaturedimagegenesis_get()->set_image_id();
 		return wp_get_attachment_image(
 			$image_id,
-			displayfeaturedimagegenesis_get()->banner_image_size(),
+			'2048x2048',
 			false,
 			array(
 				'alt'         => $this->get_image_alt_text( $image_id ),