Fix the mini player icon on first load

[geekygecko]

This change fixes the issue that when you open the app the mini player shows a pause icon when there isn't a podcast playing. It happens when the system changes between light and dark theme.

The core of the issue was that I was trying to set the Lottie drawable frame to the play icon in the custom view component init method. At this point the view hasn't been inflated yet so the drawable is null and can't have the frame set. To fix this I move setting the frame into the onLayout method and the drawable is not null.

As part of this PR I also fixed some other things:

• Cached the string resources in the custom view as when a podcast is playing this method is called every second with the playback state.
• Upgraded to Lottie 5.2.0. The main change was the XML attribute lottie_scale has been removed.
• Fixed Talkback on the mini player, it wasn't being used and it wasn't localised.

Fixes #148

device-2022-08-05-110346.mp4

[ashiagr]

Found everything good in my testing. Code changes look good as well.
Thanks you for the fix!