Admin: Update button color to align with the design system.

Updates the disabled state colors for the primary and secondary buttons to align with the WordPress Design System.

Props hbhalodia, huzaifaalmesbah, Joen, mciampini, ozgursar, wildworks.
Fixes #64797.
Built from https://develop.svn.wordpress.org/trunk@61840


git-svn-id: http://core.svn.wordpress.org/trunk@61127 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: t-hamano

wp-includes/css/buttons-rtl.css

@@ -209,8 +209,8 @@ TABLE OF CONTENTS:
 .wp-core-ui .button-secondary:disabled,
 .wp-core-ui .button-secondary.disabled,
 .wp-core-ui .button-disabled {
-	color: #949494 !important;
-	border-color: #dddddd !important;
+	color: #8a8a8a !important;
+	border-color: #d8d8d8 !important;
 	background: transparent !important;
 	box-shadow: none !important;
 	cursor: default;
@@ -313,9 +313,9 @@ TABLE OF CONTENTS:
 .wp-core-ui .button-primary:disabled,
 .wp-core-ui .button-primary-disabled,
 .wp-core-ui .button-primary.disabled {
-	color: #949494 !important;
-	background: #f0f0f0 !important;
-	border-color: #f0f0f0 !important;
+	color: #8a8a8a !important;
+	background: #e2e2e2 !important;
+	border-color: #e2e2e2 !important;
 	box-shadow: none !important;
 	text-shadow: none !important;
 	cursor: default;

wp-includes/css/buttons-rtl.min.css

@@ -208,8 +208,8 @@ TABLE OF CONTENTS:
 .wp-core-ui .button-secondary:disabled,
 .wp-core-ui .button-secondary.disabled,
 .wp-core-ui .button-disabled {
-	color: #949494 !important;
-	border-color: #dddddd !important;
+	color: #8a8a8a !important;
+	border-color: #d8d8d8 !important;
 	background: transparent !important;
 	box-shadow: none !important;
 	cursor: default;
@@ -312,9 +312,9 @@ TABLE OF CONTENTS:
 .wp-core-ui .button-primary:disabled,
 .wp-core-ui .button-primary-disabled,
 .wp-core-ui .button-primary.disabled {
-	color: #949494 !important;
-	background: #f0f0f0 !important;
-	border-color: #f0f0f0 !important;
+	color: #8a8a8a !important;
+	background: #e2e2e2 !important;
+	border-color: #e2e2e2 !important;
 	box-shadow: none !important;
 	text-shadow: none !important;
 	cursor: default;