title: Change Email with Phone number on Woocommerce Order Tracking Form or Simply track with only order number
body: <p>I want to change the Email field with the phone field to track order status on the WooCommerce order tracking form page. if not possible then I want to simply disable the Email field so my client can track their order status by entering just order number.</p>
  
  <p>inside order/form-tracking.php I tried replacing "order_email" with "order_phone" and even tried replacing it with "billing_phone" but did not track any shipment.
  The last try I made and tried to remove following entire Email section code,</p>
  
  <pre><code>&lt;p class="form-row form-row-last"&gt;&lt;label for="order_email"&gt;&lt;?php esc_html_e( 'Billing email', 'woocommerce' ); ?&gt;&lt;/label&gt; &lt;input class="input-text" type="text" name="order_email" id="order_email" value="&lt;?php echo isset( $_REQUEST['order_email'] ) ? esc_attr( wp_unslash( $_REQUEST['order_email'] ) ) : ''; ?&gt;" placeholder="&lt;?php esc_attr_e( 'Email you used during checkout.', 'woocommerce' ); ?&gt;" /&gt;&lt;/p&gt;&lt;?php // @codingStandardsIgnoreLine ?&gt;
  </code></pre>
  
  <p>But it didn't work and still says Email required.
  Any help will be highly appreciated, please...</p>