Media library: Ensure the header area is spaced consistently between view modes.

see #28946.


git-svn-id: https://develop.svn.wordpress.org/trunk@29645 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/common.css

@@ -1022,6 +1022,7 @@ th.action-links {
 }
 
 .wp-filter .search-form input[type="search"] {
+	margin: 0;
 	padding: 3px 5px;
 	width: 280px;
 	font-size: 16px;

src/wp-admin/css/media.css

@@ -563,7 +563,7 @@ border color while dragging a file over the uploader drop area */
 }
 
 .media-frame.mode-grid .media-toolbar {
-	margin: 15px 0;
+	margin-bottom: 15px;
 	height: auto;
 }