Gravatars: Remove redundant 1x srcset.

props miqrogroove.
see #22329.


git-svn-id: https://develop.svn.wordpress.org/trunk@31722 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/pluggable.php

@@ -2237,7 +2237,7 @@ function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args =
 		"<img alt='%s' src='%s' srcset='%s' class='%s' height='%d' width='%d' %s/>",
 		esc_attr( $args['alt'] ),
 		esc_url( $url ),
-		esc_attr( "$url 1x, $url2x 2x" ),
+		esc_attr( "$url2x 2x" ),
 		esc_attr( join( ' ', $class ) ),
 		(int) $args['height'],
 		(int) $args['width'],