Plugins: Add a missing space between classes on `<td>` element for custom columns of the Plugins list table.

Props crstauf.
Fixes #37460.
Built from https://develop.svn.wordpress.org/trunk@38149


git-svn-id: http://core.svn.wordpress.org/trunk@38090 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-plugins-list-table.php

@@ -816,7 +816,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 					echo "</div></td>";
 					break;
 				default:
-					$classes = "$column_name column-$column_name$class";
+					$classes = "$column_name column-$column_name $class";
 
 					echo "<td class='$classes{$extra_classes}'>";
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta4-38148';
+$wp_version = '4.6-beta4-38149';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.