fix body with "*" bug

Signed-off-by: forrestchen <forrestchen@tencent.com>

protoc-gen-grpc-gateway/gengateway/template.go

@@ -28,9 +28,6 @@ type binding struct {
 // It sometimes returns true even though actually the binding does not need.
 // But it is not serious because it just results in a small amount of extra codes generated.
 func (b binding) HasQueryParam() bool {
-	if b.Body != nil && len(b.Body.FieldPath) == 0 {
-		return false
-	}
 	fields := make(map[string]bool)
 	for _, f := range b.Method.RequestType.Fields {
 		fields[f.GetName()] = true