message: test: fix UB in instantiate.imported_memory_invalid
diff: @@ -260,7 +260,7 @@ TEST(instantiate, imported_memory_invalid)
  // Provided max exceeds the hard limit
  Module module_without_max;
  Import imp_without_max{"mod", "m", ExternalKind::Memory, {}};
  - imp.desc.memory = Memory{{1, std::nullopt}};
  + imp_without_max.desc.memory = Memory{{1, std::nullopt}};
  module_without_max.importsec.emplace_back(imp_without_max);
  EXPECT_THROW_MESSAGE(
  instantiate(module_without_max, {}, {}, {{&memory, {1, MemoryPagesLimit + 1}}}),
  