Removed unnecessary label tags

Author: mage2pratik

app/code/Magento/Config/Test/Unit/Model/_files/system_2.xml

@@ -76,7 +76,6 @@
                     <config_path>section/group/field4</config_path>
                 </field>
                 <field id="field_5" translate="label" showInWebsite="1" type="text">
-                    <label></label>
                 </field>
             </group>
             <group id="group_4" type="text" showInDefault="1" showInWebsite="1" showInStore="1">

app/code/Magento/Paypal/etc/adminhtml/system/express_checkout.xml

@@ -198,7 +198,6 @@
                     <attribute type="shared">1</attribute>
                 </field>
                 <field id="bml_wizard" translate="button_label" sortOrder="15" showInDefault="1" showInWebsite="1">
-                    <label></label>
                     <button_label>Get Publisher ID from PayPal</button_label>
                     <button_url><![CDATA[https:/financing.paypal.com/ppfinportal/cart/index?dcp=4eff8563b9cc505e0b9afaff3256705081553c79]]></button_url>
                     <frontend_model>Magento\Paypal\Block\Adminhtml\System\Config\BmlApiWizard</frontend_model>

dev/tests/integration/testsuite/Magento/Paypal/Model/Config/Structure/Reader/_files/expected/config.xml

@@ -767,7 +767,6 @@
                             <attribute type="shared">1</attribute>
                         </field>
                         <field id="bml_wizard" translate="button_label" sortOrder="15" showInDefault="1" showInWebsite="1">
-                            <label></label>
                             <button_label>Get Publisher ID from PayPal</button_label>
                             <button_url><![CDATA[https:/financing.paypal.com/ppfinportal/cart/index?dcp=4eff8563b9cc505e0b9afaff3256705081553c79]]></button_url>
                             <frontend_model>Magento\Paypal\Block\Adminhtml\System\Config\BmlApiWizard</frontend_model>