move Netfront to prevous place

In ua-parser commit 07f03beeb6161bed8be6f752067357aafc09ad63 "Move NetFront to stay a step ahead of the new location of Silk" the whole Netfront regexes were moved. As here only the Playstation Vita is affected IMO only this regex should be moved.
This PR reverts the not affected regexes to the old location.