LibWeb: Move HTMLToken in HTMLDocumentParser

This replaces a copy construction of an HTMLToken with a move(). This
allows HTMLToken to be made non-copyable in a further commit.

Userland/Libraries/LibWeb/HTML/Parser/HTMLDocumentParser.cpp

@@ -2103,7 +2103,7 @@ void HTMLDocumentParser::handle_in_table_text(HTMLToken& token)
             return;
         }
 
-        m_pending_table_character_tokens.append(token);
+        m_pending_table_character_tokens.append(move(token));
         return;
     }