message: Fix test that now has FixedArray flag
diff: @@ -447,7 +447,7 @@ TEST_CASE("Read/write via structured of basic types", "[serialiser]")
  CHECK(o.type.name == "int32_t");
  CHECK(o.type.basetype == SDBasic::Array);
  CHECK(o.type.byteSize == 4);
  - CHECK(o.type.flags == SDTypeFlags::NoFlags);
  + CHECK(o.type.flags == SDTypeFlags::FixedArray);
  CHECK(o.data.children.size() == 4);
  