Changelog: 1601 fragment

changelog.d/1601-street-level-keyless-default.md

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+- Without a Mapillary token, Street Level starts on the first keyless source
+  (KartaView) instead of opening on Mapillary's `KEY REQUIRED` with nothing on
+  the globe. A share link that turns a source off is respected
+  (asturksever, #1601).