macosx: fix continous playback store cutoff

This problem took me a while to track down. I noticed that sometimes the continuous playback feature just didn't work.

Background: I sometimes lose track of which is the last episode in a season that I had watched. So, in order to find out, I restart a candidate episode and expect it to continue near the end if I watched it to near the end before. Sometimes this worked, and sometimes it didn't, meaning even though I had watched the episode, it would restart at the beginning.

The reason is that, on MacOS, the continue time is only stored if you watch less than 95% of the video. So, depending on the overall length, you get different behavior, and overall it doesn't really "feel" continuous for some use-cases. I strongly recommend increasing this max store percent to 99.