fix: bug when video continues to play when exiting content #251
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There is an issue on Android where 'Fragment.onDestroy()' is not called after one fragment was replaced with another using the 'FragmentManager.replace()' function without 'addToBackStack()'. And after a long discussion with @volodymyr-chekyrta we decided to make a workaround for this issue.
All new CourseUnitContainerFragment instances will be added with 'addToBackStack()' and then to go to the previous fragment we need to find it and call 'popBackStack(previousFragmentTagName)'.
Using this workaround, also, was fixed a bug where the 'Back to outline' button would not work.