VideoPlayer: fix wrong index when starting cast

In onSaveInstanceState, without a currentMediaList we would default to savedMediaList, but without a currentIndex, we would default to 0 and not to savedMediaIndex. When restarting the videoplayer, we do have a savedInstanceState in the on create that is used to reload the previous medialist, but it only reloaded 0.

added 7 commits

• 37fb8f5d...2e6e0bd6 - 6 commits from branch videolan:master
• bc0818e9 - VideoPlayer: fix wrong index when starting cast

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enabled an automatic merge when all merge checks for bc0818e9 pass

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merged

mentioned in issue #3184 (closed)