Add a default 0 value for start and end in the media_element entity time ranges#1428

Matus Tomlein (matus-tomlein) merged 3 commits intorelease/4.6.1snowplow/snowplow-javascript-tracker:release/4.6.1from

issue/fix_missing_end_in_seekable_propertysnowplow/snowplow-javascript-tracker:issue/fix_missing_end_in_seekable_propertyCopy head branch name to clipboard