Fix record of new_episodes mode

[vickyliin]

Fix #753

I found play_count is heavily relied on in the tests to check if a record is newly added or being played.

I'm wondering if

• I should modify the logic of play_count to be added whenever a record has been played no matter from loaded cassettes or from a real request (like the change in this PR now) and change all the related tests
• or I should find a work around