Potential bug stopping cron after enabling RW filesystem

[rogerclarkmelbourne]

In the configure page, in some places the file system is remounted as RW e.g.

https://github.com/AndyTaylorTweet/Pi-Star_DV_Dash/blob/master/admin/configure.php#L247-L250

However the cron service is not stopped until after the file system is made RW, and there is a small chance that cron may run between the file system being mounted RW and cron being stopped

I think cron should probably be stopped before the files system is mounted as RW