Don't modify post_author during a quick edit when the post type doesn't support authors.

props ocean90.
fixes #16645.

Built from https://develop.svn.wordpress.org/trunk@25698


git-svn-id: http://core.svn.wordpress.org/trunk@25613 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -1085,6 +1085,9 @@ class WP_Posts_List_Table extends WP_List_Table {
 			} ?>
 			<input type="hidden" name="post_view" value="<?php echo esc_attr( $m ); ?>" />
 			<input type="hidden" name="screen" value="<?php echo esc_attr( $screen->id ); ?>" />
+			<?php if ( ! $bulk && ! post_type_supports( $screen->post_type, 'author' ) ) { ?>
+				<input type="hidden" name="post_author" value="<?php echo esc_attr( $post->post_author ); ?>" />
+			<?php } ?>
 			<span class="error" style="display:none"></span>
 			<br class="clear" />
 		</p>