change buttons that act as links to anchor tags

Buttons and links are different and serve different purposes. Links _go
somewhere_ while buttons _do something_.

When I click on a movie title to _go to_ the movie page the thing I
click should act like a link. If I ctrl+click or middle click it it
should still act like a link... by opening in a new tab.

src/controllers/itemDetails/index.js

@@ -785,7 +785,7 @@ function renderDetailImage(elem, item, imageLoader) {
     imageLoader.lazyChildren(elem);
 
     // Avoid breaking the design by preventing focus of the poster using the keyboard.
-    elem.querySelector('button').tabIndex = -1;
+    elem.querySelector('a').tabIndex = -1;
 }
 
 function renderImage(page, item) {