Fix podcast title

[kirtangajjar]

Description of the Change

This PR removes the Podcast customisation logic. The main reason being that since the change was added in the first github commit of this project 6 years ago, there was a bug in code because of which the podcast title was never changed. This changed with this PR, which tried to fix it, but the only problem with this fix is that there is no way to set the podcasting_title term meta.

For users who have been using this plugin for years, it would appear that the behavior of the plugin has been changed. Since we've anyway made the podcast title filterable, anyone who wants to modify the podcast title can use the filter.

Closes #292.

How to test the Change

1. Checkout PR branch
2. Open podcast feed and ensure that the podcast title does not contain site name.

Changelog Entry

Fixed - Podcast title changing

Credits

Props @kirtangajjar

Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [x] All new and existing tests pass.