btrfs: use helpers to convert from seconds to jiffies in transaction_kthread

The kernel provides easy to understand helpers to convert from human
understandable units to the kernel-friendly 'jiffies'. So let's use
those to make the code easier to understand. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>