Revert add payment button changes

[stitesExpensify]

Details

We accidentally mislead a contributor to add some changes we don't actually want.

This PR:

1. Removes the hiding of the "add payment method" button (you can always add accounts)
2. Properly fixes a UI bug that would show multiple paypal accounts in your payment methods
3. Navigates back to the payments page after you add a paypal account

Fixed Issues

$ #4238

Tests/QA

1. Create a new account
2. Go to the payments page in settings
3. Click the "Add Payment Method" button
4. Click the paypal.me button
5. Enter a paypal.me username
6. Make sure the button says "Add paypal account" and click it
7. Make sure you are brought back to the payments page
8. Make sure you see a new payment method
9. Click the "Add Payment Method" button again
10. Click the paypal.me button again
11. Enter a different paypal.me username
12. Make sure the button says "Update paypal account" and click it
13. Make sure the paypal changes

Tested On

• Web
• Mobile Web
• Desktop
• iOS
• Android

Screenshots

Web

2021-07-26_18-15-58.mp4

[Gonals]

Minor comment! Looking good otherwise

[Gonals]

Let's not capitalize Cuenta here, since we don't capitalize usuario above.

[stitesExpensify]

Sounds good. Updated!

[OSBotify]

✋ This PR was not deployed to staging yet because QA is ongoing. It will be automatically deployed to staging after the next production release.

[OSBotify]

🚀 Deployed to staging in version: 1.0.81-5🚀

platform	result
🤖 android 🤖	success ✅
🖥 desktop 🖥	success ✅
🍎 iOS 🍎	failure ❌
🕸 web 🕸	success ✅

[OSBotify]

🚀 Deployed to production in version: 1.0.82-7🚀

platform	result
🤖 android 🤖	success ✅
🖥 desktop 🖥	success ✅
🍎 iOS 🍎	success ✅
🕸 web 🕸	success ✅