Code to remove from Sixteen Nine Pro functions.php to remove the avatar image from the site header

gistfile1.php

//* Add support for custom header
add_theme_support( 'custom-header', array(
	'admin-preview-callback' => 'sixteen_nine_admin_header_callback',
	'default-text-color'     => 'ffffff',
	'header-selector'        => '.site-header .site-avatar img',
	'height'                 => 224,
	'width'                  => 224,
    'wp-head-callback'       => '__return_false',
) );

function sixteen_nine_admin_header_callback() {
	echo get_header_image() ? '<img src="' . get_header_image() . '" />' : get_avatar( get_option( 'admin_email' ), 224 );
}



//* Hook site avatar before site title
add_action( 'genesis_header', 'sixteen_nine_site_gravatar', 5 );
function sixteen_nine_site_gravatar() {

	$header_image = get_header_image() ? '<img alt="" src="' . get_header_image() . '" />' : get_avatar( get_option( 'admin_email' ), 224 );
	
	printf( '<div class="site-avatar"><a href="%s">%s</a></div>', home_url( '/' ), $header_image );

}