tuple_vector: random_access_iterator_tag is missing

[simplex-fx]

EASTL_ITC_NS::random_access_iterator_tag should be used instead of random_access_iterator_tag in the tuple_vector sources,
to make it compile if EASTL_STD_ITERATOR_CATEGORY_ENABLED is set.

[grojo-ea]

Thanks for reporting this. This was fixed by #475. We also now have CI running that tests with EASTL_STD_ITERATOR_CATEGORY_ENABLED so things like these don't happen again.