Update select role mapping to use HTML display size

In this HTML PR I am planning on changing the definition of how combobox
vs listbox rendering is done with size and multiple attributes:
whatwg/html#11460

This PR defers to the HTML definition of display size which defines
combobox vs listbox rendering based on multiple and size attributes.

Author: josepharhar

index.html

@@ -2906,8 +2906,7 @@ <h2 id="docconformance">
           </tr>
           <tr>
             <th id="el-select" tabindex="-1">
-              [^select^] (with NO `multiple` attribute and NO `size`
-              attribute having value greater than `1`)
+              [^select^] (with a <a data-cite="html/form-elements.html#concept-select-size">display size</a> of `1`)
             </th>
             <td>
               <code>role=<a href="#index-aria-combobox">combobox</a></code>
@@ -2928,8 +2927,7 @@ <h2 id="docconformance">
           </tr>
           <tr>
             <th id="el-select-multiple-or-size-greater-1" tabindex="-1">
-              [^select^] (with a `multiple` attribute or a `size` attribute
-              having value greater than `1`)
+              [^select^] (with a <a data-cite="html/form-elements.html#concept-select-size">display size</a> greater than `1`)
             </th>
             <td>
               <code>role=<a href="#index-aria-list">listbox</a></code>