Fix payment method name for the pay for order page

[wjrosa]

Changes proposed in this Pull Request:

This PR fixes the payment method label for orders paid using the Pay for Order page. #4036 broke it with the change to the container title. I am removing the container title to fix the issue, which is not a big deal since we will hide the title and the container borders in #3896

Testing instructions

• Checkout and build this branch on your test environment (fix/order-pay-for-order-payment-method-name)
• Connect your Stripe account
• Copy your child payment method configuration ID from here: https://dashboard.stripe.com/settings/payment_methods (labeled "Your configuration")
• Insert the ID above on client/classic/upe/payment-processing.js:136. This is temporary until the parent configuration, labeled WooCommerce Inc., supports all methods by default
• Build the frontend files (npm run build:webpack)
• Enable the SPE feature flag (_wcstripe_feature_spe). You can do it by either hardcoding the return value of is_spe_available to true or by running npm run wp option update _wcstripe_feature_spe 'yes'
• As a merchant, disable the legacy checkout experience in settings (wp-admin/admin.php?page=wc-settings&tab=checkout&section=stripe&panel=settings)
• Enable the Single Payment Element feature
• Create a new order in a pending payment state
• As the order owner, try to pay for the order
• Confirm the order payment method is correctly identified.

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• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

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• Added testing instructions to the Release Testing Instructions wiki page (or does not apply)
• Added the needs docs label (or does not apply)
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