dash: fix delay for minimumUpdatePeriod in cases where the time at which the manifest was requested is not known (usage of a customManifestLoader)
dash: fix delay for minimumUpdatePeriod in cases where the time at which the manifest was requested is not known (usage of a customManifestLoader)

canalplus/rx-player,canalplus/rx-player,canalplus/rx-player,canalplus/rx-player,canalplus/rx-player