chore: use wc_get_template() function

Update wcdp_step_1.php and wcdp_step_1_amount.php

Author: jonas-hoebenreich

includes/templates/wcdp_step_1.php

@@ -83,7 +83,14 @@
 
         <?php
         //Donation Amount section
-        include('wcdp_step_1_amount.php');
+        wc_get_template('wcdp_step_1_amount.php',
+            array(
+                'min_donation_amount'=> $min_donation_amount,
+                'max_donation_amount' => $max_donation_amount,
+                'product_id' => $product_id,
+                'product' => $product,
+                'value' => $value,
+            ), '', WCDP_DIR . 'includes/templates/');
 
         //Variation fields
         include('wcdp_step_1_variations.php');

includes/templates/wcdp_step_1_amount.php

@@ -2,7 +2,10 @@
 /**
  * WCDP Shortcode Form
  * @var float $min_donation_amount
+ * @var float $max_donation_amount
  * @var int $product_id
+ * @var WC_Product $product
+ * @var array $value
  */
 if (!defined('ABSPATH')) exit;