Filesystem API: Expicitly set directory permissions in WP_Filesystem_SSH2::mkdir().

This ensures the permissions are correct after a directory is created with `ssh2_sftp_mkdir()`, which appears to be affected by system `umask` settings.

Props bbrdaric.
Fixes #49218.

git-svn-id: https://develop.svn.wordpress.org/trunk@48090 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-filesystem-ssh2.php

@@ -695,6 +695,9 @@ class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
 			return false;
 		}
 
+		// Set directory permissions.
+		ssh2_sftp_chmod( $this->sftp_link, $path, $chmod );
+
 		if ( $chown ) {
 			$this->chown( $path, $chown );
 		}