HIS GOOD LOOKS  Those high cheekbones, those soulful brown eyes – it&#39;s no wonder why Johnny Depp&#39;s Pirates of the Caribbean costar Keira Knightley calls him &#34;eye candy.&#34; But the chiseled actor (in the Bahamas in February) doesn&#39;t get the fuss about his own allure. &#34;I have no idea,&#34; he says.  Credit: LDP Images  Updated: Thursday Jul 06, 2006 | 06:00 AM EDT