Hi,
The checkout/cart.php view file is used by the legacy checkout. If you're using the new checkout of HikaShop 3+ (you have the "checkout legacy" setting turned off in the HikaShop configuration), then it's the view file checkout/show_block_cart.php that you need to edit.
And in that case, you want to change the line:
if(!empty($this->options['show_price']) && $taxes > 0){
to:
Note that if you want to check which view file is used where, you can temporarily activate the "Display view files" setting of the HikaShop configuration.