Remove Extrinsics length hack (when on testnets)

[jacogr]

Introduced in #573 - still not available on testnets as of this writing, so cannot be done as of yet

• Alexander (out to in the 0.3.2 version, paritytech/polkadot@4c7fe32)
• Charred Cherry

Affected changes -

https://github.com/polkadot-js/api/pull/573/files/b92607ab766cde0231010ecb76558d1f7669fb65..af327c46cd4ce9f09893b92c9db277743a8bce79#diff-f98351eb7cb1460dd4aabbbd6027b0dbR50

[jacogr]

The good thing is that the hack does work on the running testnets and a local dev node. (However, as we know - push in exactly the wrong values and it will fail - so urgency remains)

[jacogr]

Looking at a network after Alex to reset this - as it stands, old info without is still in the early blocks. (So when you need to parse, it is needed)

[polkadot-js-bot]

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