Fix serviceConfig within scope of copy (no need to clear first)

Signed-off-by: NeatGuyCoding <15627489+NeatGuyCoding@users.noreply.github.com>

Author: NeatGuyCoding

spring-grpc-spring-boot-autoconfigure/src/main/java/org/springframework/grpc/autoconfigure/client/GrpcClientProperties.java

@@ -349,7 +349,6 @@ public ChannelConfig copy() {
 			copy.defaultDeadline = this.defaultDeadline;
 			copy.health.copyValuesFrom(this.getHealth());
 			copy.ssl.copyValuesFrom(this.getSsl());
-			copy.serviceConfig.clear();
 			copy.serviceConfig.putAll(this.serviceConfig);
 			return copy;
 		}