fuzz: fix use of literal in default initialization. (#6268)
fuzz: fix use of literal in default initialization. (#6268)

We hit
https://stackoverflow.com/questions/17264067/chosen-constructor-is-explicit-in-copy-initialization-error-with-clang-4-2
on Google import.

Signed-off-by: Harvey Tuch <c185081708e02336640916420d0c772668570de5@google.com>

envoyproxy/envoy-wasm,istio/envoy,istio/envoy,lyft/envoy,lizan/envoy,eklitzke/envoy,eklitzke/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,dnoe/envoy,lizan/envoy,dnoe/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lizan/envoy,jrajahalme/envoy,lyft/envoy,dnoe/envoy,istio/envoy,lyft/envoy,eklitzke/envoy,lizan/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,jrajahalme/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,istio/envoy,dnoe/envoy,istio/envoy,lyft/envoy,lizan/envoy,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy-wasm,istio/envoy,eklitzke/envoy