Escape ~ and - in string PIDs in the URL

Our PIDs are strings. In URL query parameters such as `hiddenLocalTracksByPid` we include the string PID as-is and separate it from the rest of the parameter value with ~ and - characters. However, this breaks if the PID itself contains those characters.

We should escape them somehow.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-618)