Fix invalid return type provided for private method

Author: lbajsarowicz

app/code/Magento/Catalog/Model/Product/TierPriceManagement.php

@@ -224,9 +224,9 @@ private function isCustomerGroupApplicable(string $customerGroupId, array $price
     /**
      * Returns current Price Scope configuration value
      *
-     * @return string
+     * @return int
      */
-    private function getPriceScopeConfig(): string
+    private function getPriceScopeConfig(): int
     {
         return (int)$this->config->getValue('catalog/price/scope', ScopeInterface::SCOPE_WEBSITE);
     }

app/code/Magento/Catalog/Test/Unit/Model/Product/TierPriceManagementTest.php

@@ -203,7 +203,9 @@ public function testSuccessDeleteTierPrice()
             ->method('getValue')
             ->with('catalog/price/scope', ScopeInterface::SCOPE_WEBSITE)
             ->willReturn(0);
-        $this->priceModifierMock->expects($this->once())->method('removeTierPrice')->with($this->productMock, 4, 5, 0);
+        $this->priceModifierMock->expects($this->once())
+            ->method('removeTierPrice')
+            ->with($this->productMock, 4, 5, 0);
 
         $this->assertTrue($this->service->remove('product_sku', 4, 5, 0));
     }