Fix loc_type of `bp_location's created by update_watchpoint.

	Fix loc_type of `bp_location's created by update_watchpoint.
	* breakpoint.c (allocate_bp_location): Remove the bp_type parameter.
	Replace bp_type by bpt->type.  Update prototype.  All callers updated.
	(add_location_to_breakpoint):  Remove the bp_type parameter.
	Replace bp_type by b->type.  All callers updated.
	(set_breakpoint_location_function): Replace bptype by b->type.