[TASK] Move express-install to contrib (flowplayer)

To resolve /t3lib few more files should be moved:
Moves flowplayer styles for express-install to contrib.

Change-Id: I8d987774c9ff2c9ab13f86ab6086c1d7fb608afa
Resolves: #49151
Releases: 6.2
Reviewed-on: https://review.typo3.org/21450
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Markus Klein
Tested-by: Markus Klein