Running Challenges v1.1.4

Back, after a long absence, and things broke while we weren't looking...

• Pull in fixes to query local parkrun site for volunteer data
• Fix the challenges link not appearing for the Polish site e.g. here
• The shortcut link didn't seem to got to any site other than the UK one, so make an attempt to get that right more often.
• Also attempt to backfill the saved user data with a home parkrun URL if it doesn't exist
• Remove unneeded permission from extension manifest to access parkrun.org.uk - it doesn't seem to be required.
• Change any place we made requests or constructed URLs to http, or location.protocol to use https explicitly
• Get rid of loads of JQuery HTML style parsing errors generated by the background page when loading the
  Technical Event Information page.