Administration: Update default fallback color for SVG icons.

Currently, when an SVG is used as a menu icon, the color is inconsistent with the other, default dashicons and the contrast ratio does not meet the minimum requirement for accessibility.

This updates the base color for the default `fresh` color scheme to ensure consistency and proper contrast.

Props swift, dschalk.
Fixes #44209.
Built from https://develop.svn.wordpress.org/trunk@44353


git-svn-id: http://core.svn.wordpress.org/trunk@44183 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/misc.php

@@ -925,7 +925,7 @@ function wp_color_scheme_settings() {
 	} else {
 		// Fall back to the default set of icon colors if the default scheme is missing.
 		$icon_colors = array(
-			'base'    => '#82878c',
+			'base'    => '#a0a5aa',
 			'focus'   => '#00a0d2',
 			'current' => '#fff',
 		);

wp-includes/general-template.php

@@ -4043,7 +4043,7 @@ function register_admin_color_schemes() {
 		false,
 		array( '#222', '#333', '#0073aa', '#00a0d2' ),
 		array(
-			'base'    => '#82878c',
+			'base'    => '#a0a5aa',
 			'focus'   => '#00a0d2',
 			'current' => '#fff',
 		)

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44352';
+$wp_version = '5.1-alpha-44353';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.