Use original method names for gRPC paths

Stop converting method names to snake_case when generating the gRPC
service paths to maintain compatibility with protobuf definitions.

roto-tonic/src/generated/interop.rs

@@ -463,7 +463,6 @@ impl Service<http::Request<BoxBody>> for InteropServiceServer {
             let payload = bytes_vec.slice(5..);
             let mut routed = false;
 
-
             if path == "/interop.InteropService/UnaryCall" {
                 let request_msg = match OwnedUnaryRequest::decode(payload) {
                     Ok(msg) => msg,
@@ -495,7 +494,7 @@ impl Service<http::Request<BoxBody>> for InteropServiceServer {
                 routed = true;
                 return Ok(http::Response::builder().status(200).header("content-type", "application/grpc").body(res_body).unwrap());
             }
-            if path == "/interop.InteropService/streaming_call" {
+            if path == "/interop.InteropService/StreamingCall" {
                 let res_body = BoxBody::new(StatusBody::new(Some(Bytes::from_static(&[0, 0, 0, 0, 0])), 0));
                 return Ok(http::Response::builder().status(200).body(res_body).unwrap());
             }