Fix percent-encoding of percent sign in grpc-message header
#2107
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Motivation
I got an unexpected JavaScript client-side gRPC-Web error
Uncaught URIError: malformed URI sequenceand traced it down to the%character not being encoded by the tonic-based server. My error message included a percent sign 😏.Solution
Correct usage of the dependent crate's
AsciiSetstructure. Otherwise, the%character doesn't get changed at all.