www: correct the default select for SF:

The standard UFD-DOS select code for SFx: is 46; 44 is used by some
old DOS but it shouldn't be marked as the default.

esp32/www/abcbus.html

@@ -86,7 +86,7 @@
 	      <span>Device select:</span>
 	      <input type="number" name="abc.io.sf.devsel" min="0" max="63" value="44" />
 	    </label>
-	    (44)
+	    (46)
 	  </div>
 	</div>
 	<p class="help,sf">8″ floppies: ABC838, DD8, DD88<br />