Do not whitespace-strip <script>'s language="" attribute

This matches implementations, which only whitespace-strip the type="" attribute.

Closes #7923.

Author: hiroshige-g

source

@@ -60180,8 +60180,10 @@ o............A....e
     <p>then let <var>the script block's type string</var> for this <code>script</code> element be
     "<code data-x="">text/javascript</code>".</p>
 
-    <p>Otherwise, if <var>el</var> has a <code data-x="attr-script-type">type</code> attribute,
-    then let <var>the script block's type string</var> be the value of that attribute.</p>
+    <p>Otherwise, if <var>el</var> has a <code data-x="attr-script-type">type</code> attribute, then
+    let <var>the script block's type string</var> be the value of that attribute with <span
+    data-x="strip leading and trailing ASCII whitespace">leading and trailing ASCII whitespace
+    stripped</span>.</p>
 
     <p>Otherwise, <var>el</var> has a non-empty <code data-x="attr-script-language">language</code>
     attribute; let <var>the script block's type string</var> be the concatenation of "<code
@@ -60195,10 +60197,9 @@ o............A....e
     attribute present.</p>
    </li>
 
-   <li><p>If <var>the script block's type string</var> with <span data-x="strip leading and
-   trailing ASCII whitespace">leading and trailing ASCII whitespace stripped</span> is a
-   <span>JavaScript MIME type essence match</span>, then set <var>el</var>'s <span
-   data-x="concept-script-type">type</span> to "<code data-x="">classic</code>".</p></li>
+   <li><p>If <var>the script block's type string</var> is a <span>JavaScript MIME type essence
+   match</span>, then set <var>el</var>'s <span data-x="concept-script-type">type</span> to "<code
+   data-x="">classic</code>".</p></li>
 
    <li><p>Otherwise, if <var>the script block's type string</var> is an <span>ASCII
    case-insensitive</span> match for the string "<code data-x="">module</code>", then set