Harshavardhana 458f22f37c log: Fix printing of signature error request headers. (#4444)
The following commit f44f2e341c931222a8f1e3f1e9911dda80bb2dc0
fix was incomplete and we still had presigned URLs printing
in query strings in wrong fashion.

This PR fixes this properly. Avoid double encoding
percent encoded strings such as

`s3%!!(MISSING)A(MISSING)`

Print properly as json encoded.

`s3%3AObjectCreated%3A%2A`
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