Fix the IPsec SPD arrows

Currently, a `BLACK RIGHT-POINTING POINTER` and a `BLACK LEFT-POINTING
TRIANGLE` are used to display the direction.

This commit changes both arrows to be `POINTER`s.

src/usr/local/www/status_ipsec_spd.php

@@ -64,7 +64,7 @@
 ##|-PRIV
 
 define('RIGHTARROW', '►');
-define('LEFTARROW',  '◀');
+define('LEFTARROW',  '◄');
 
 require("guiconfig.inc");
 require("ipsec.inc");