Remove Subtotal from email

I tried at this file email-order-details.php this code

<tfoot>
		<?php
			if ( $totals = $order->get_order_item_totals() ) {
				$i = 0;
				foreach ( $totals as $total ) {
					$i++;
					if ( ($total['label'] != 'Subtotal:') || ($total['label'] !== 'Subtotal:') ) :
					?><tr class="321341">
						<th class="td" scope="row" colspan="2" style="text-align:left; <?php if ( $i === 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['label']; ?></th>
						<td class="td" style="text-align:left; <?php if ( $i === 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['value']; ?></td>
					</tr><?php
					endif;
				}
			}
		?>
	</tfoot>

But it does not work.
Can you help me.

https://wordpress.org/plugins/woocommerce/