tabs: click on page load only with anchor tabs

Behave according to docs: only accept a quoted string when the tabs
are a tags.

Otherwise there is no way to prevent a click on page load when
the location contains a hash, breaking initialIndex: -1 configuration.

Author: phloxic

src/tabs/tabs.js

@@ -240,7 +240,7 @@
 		}); 
 
 		// open initial tab
-		if (location.hash) {
+		if (location.hash && conf.tabs === "a") {
 			self.click(location.hash);
 		} else {
 			if (conf.initialIndex === 0 || conf.initialIndex > 0) {