Administration: Remove erroneous transition-delay values from CSS files.

Although unitless zero is allowed for `<length>` CSS data type, it's invalid for `<time>` data type.

Props chetan200891, manuel_84, GaryJ.
Fixes #43195.

git-svn-id: https://develop.svn.wordpress.org/trunk@42689 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/common.css

@@ -2455,7 +2455,7 @@ div.star-holder .star-rating {
 	font-weight: 400;
 	font-style: normal;
 	vertical-align: top;
-	transition: color .1s ease-in 0;
+	transition: color .1s ease-in;
 	text-align: center;
 	color: #ffb900;
 }

src/wp-admin/css/themes.css

@@ -1182,7 +1182,7 @@ div#custom-background-image img {
 	display: inline-block;
 	line-height: 1;
 	text-align: center;
-	transition: background-color .1s ease-in 0;
+	transition: background-color .1s ease-in;
 }
 
 .background-position-control .background-position-center-icon {

src/wp-includes/css/dashicons.css

@@ -25,7 +25,7 @@
 	font-style: normal;
 	vertical-align: top;
 	text-align: center;
-	transition: color .1s ease-in 0;
+	transition: color .1s ease-in;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }