Fix search box position on the Add Plugins screen after resizing the window to narrower than 1000px and then back to wider than 1200px. Fixes #30658.

git-svn-id: https://develop.svn.wordpress.org/trunk@30830 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/common.css

@@ -1012,6 +1012,10 @@ th.action-links {
 	vertical-align: top;
 }
 
+.wp-filter .search-form.search-plugins {
+	display: inline-block;
+}
+
 .wp-filter .drawer-toggle {
 	display: inline-block;
 	margin: 0 10px;