- Remove black lines below podcast controls
- fix uncentered dropzone when starting native fullscreen, by slightly
  increasing the min height
- fix disappearing or uncentered dropzone when changing between
  normal and minimum view quickly
- consolidate dropzone and podcast sizings in interface builder

(cherry picked from commit 58b713c7f84e8eb9eedc8ca383ac59cd212db234)
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>