[config] fixed wrong function name for scroller config
[config] fixed wrong function name for scroller config

Should call elm_config_scroll_thumbscroll_hold_threshold_get but this line calls elm_config_scroll_thumbscroll_threshold_get.

tasn/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,tasn/elementary,tasn/elementary