adb: fix adb remount -R

A regression from commit 8c2198c8
("adb: use shell for remount to forward return codes.") where the
optional argv[1] got missed for the remount command.  This change
hands off _all_ the arguments if to a shell and activates some of
the extra features in the remount command.

$ adb remount --help
remount [-h] [-R] [-T fstab_file] [partition]...
	-h --help	this help
	-R --reboot	disable verity & reboot to facilitate remount
	-T --fstab	custom fstab file location
	partition	specific partition(s) (empty does all)

Remount specified partition(s) read-write, by name or mount point.
-R notwithstanding, verity must be disabled on partition(s).
$

SideEffects: adb remount [-h] [-R] [-T fstab_file] [partition]...
Test: adb-remount-test.sh
Bug: 138577868
Bug: 139283818
Bug: 139226412
Change-Id: I8223d4000ab20857e9b634e4d4a326eed530d7be