Use getLiveDelay from Dash.js API if existent and use the preset value instead of our default when possible
Use getLiveDelay from Dash.js API if existent and use the preset value instead of our default when possible

(cherry picked from commit f93ea9746a5b1800a825d5e860df40649692a008)

streamroot/dashjs-p2p-wrapper,streamroot/dashjs-p2p-wrapper,streamroot/dashjs-p2p-wrapper