style: Remove some unneeded indirection.

All TElement's implement Copy, and are just pointers, so the double indirection
is stupid.

I'm going to try to see if removing this double-indirection fixes some
selector-matching performance, and this is a trivial pre-requisite while I wait
for Talos results.

components/style/style_resolver.rs

@@ -428,7 +428,7 @@ where
 
             // Compute the primary rule node.
             stylist.push_applicable_declarations(
-                &self.element,
+                self.element,
                 implemented_pseudo.as_ref(),
                 self.element.style_attribute(),
                 self.element.get_smil_override(),
@@ -502,7 +502,7 @@ where
         // NB: We handle animation rules for ::before and ::after when
         // traversing them.
         stylist.push_applicable_declarations(
-            &self.element,
+            self.element,
             Some(pseudo_element),
             None,
             None,