Fix byte array copy

Author: kazu-321

src/ros2cs/rosidl_generator_cs/resource/msg.cs.em

@@ -336,8 +336,11 @@ public class @(message_class) : @(internals_interface), @(parent_interface)
       int arraySize = 0;
       IntPtr pArr = native_read_field_@(member.name)(out arraySize, handle);
       @(get_field_name(member.type, member.name, message_class)) = new @(get_dotnet_type(member.type.value_type))[arraySize];
+@[    if (get_marshal_array_type(member.type)) == 'char']@
+      byte[] __@(get_field_name(member.type, member.name, message_class)) = new byte[arraySize];
+@[    else]@
       @(get_marshal_array_type(member.type))[] __@(get_field_name(member.type, member.name, message_class)) = new @(get_marshal_array_type(member.type))[arraySize];
-
+@[    end if]@
       if (arraySize != 0)
       {
         int start = 0;
@@ -451,4 +454,4 @@ public class @(message_class) : @(internals_interface), @(parent_interface)
 @#<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 @[for ns in reversed(message.structure.namespaced_type.namespaces)]@
 }  // namespace @(ns)
-@[end for]@
+@[end for]@