HID: picolcd_core: Remove setting hdev->claimed before calling hid_hw_start()

Current implementation of hid_hw_start() allows connect_mask to be 0.
Setting hdev->claimed = HID_CLAIMED_INPUT before calling hid_hw_start() is not
necessary. Remove it.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-By: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>