Update viewer.js
Update viewer.js

description; Move _updateSequenceButtons behind goToPage()
TMUND/openseadragon,janelia-flyem/openseadragon,avandecreme/openseadragon,goofwear/openseadragon,msalsbery/openseadragon,rdlester/openseadragon,mcanthony/openseadragon,daverome/openseadragon,Iced-Tea/openseadragon,Iced-Tea/openseadragon,mcanthony/openseadragon,msalsbery/openseadragon,seanich/openseadragon,openseadragon/openseadragon,LarissaSmith/openseadragon,jmnetus/openseadragon,seanich/openseadragon,sul-dlss/openseadragon,LarissaSmith/openseadragon,goofwear/openseadragon,openseadragon/openseadragon,lidasong2014/openseadragon,daverome/openseadragon,ricochet2200/openseadragon,janelia-flyem/openseadragon,shaunstanislaus/openseadragon,shaunstanislaus/openseadragon,ricochet2200/openseadragon,TMUND/openseadragon,rdlester/openseadragon,lidasong2014/openseadragon,avandecreme/openseadragon,LafayetteCollegeLibraries/openseadragon,jmnetus/openseadragon