Use a single icon for folders upsell

[SergioEstevao]

| 📘 Part of: # |
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Fixes #

This PR removes the locked folders icon and uses an icon with the plus instead.

To test

Free user

1. Open the app as a free user.
2. Go to the podcasts screen.
3. You should see a folders icon with a plus.
4. Tap on the icon.
5. An upsell flow should start.
6. Go back and open any podcast.
7. You should see a folder icon with a plus.
8. Tap on the icon.
9. An upsell flow should start.

Subscribed user

1. Open the app as a subscribed user.
2. Go to the podcasts screen.
3. You should see a folders icon with a plus.
4. Tap on the icon.
5. Folder creation flow should start.
6. Go back and open any podcast.
7. You should see a folder icon if the podcast does not belong to a folder or folder with checkmark if belongs to a folder
8. Tap on the icon.
9. An folder selection flow should start.

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

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[danielebogo]

Thanks @SergioEstevao ! It works as expected!