Remove duplicate constant name

Author: JPry

class-pinterest-for-woocommerce.php

@@ -165,7 +165,6 @@ public function maybe_init_plugin() {
 		private function define_constants() {
 			define( 'PINTEREST_FOR_WOOCOMMERCE_PREFIX', 'pinterest-for-woocommerce' );
 			define( 'PINTEREST_FOR_WOOCOMMERCE_PLUGIN_BASENAME', plugin_basename( PINTEREST_FOR_WOOCOMMERCE_PLUGIN_FILE ) );
-			define( 'PINTEREST_FOR_WOOCOMMERCE_VERSION', $this->version );
 			define( 'PINTEREST_FOR_WOOCOMMERCE_OPTION_NAME', 'pinterest_for_woocommerce' );
 			define( 'PINTEREST_FOR_WOOCOMMERCE_DATA_NAME', 'pinterest_for_woocommerce_data' );
 			define( 'PINTEREST_FOR_WOOCOMMERCE_LOG_PREFIX', 'pinterest-for-woocommerce' );