e_policy_wl/e_service_quickpanel: refactoring for scrollable state of quickpanel
1. Change code to use E_Quickpanel_Client_Scroll_State enumeration not integer.
- E_QP_Client's scrollable value
- e_qp_client_scrollable_state_set
- e_qp_client_scrollable_state_get
2. Change code to use recommended function not deprecated function.
- e_qp_client_scrollable_set -> e_qp_client_scrollable_state_set
- e_qp_client_scrollable_get -> e_qp_client_scrollable_state_get
Change-Id: I822fe6ce40f7ffc58a9b432fa2d6437172425d56