BIP 341: Fix taproot_tweak_pubkey

`lift_x` returns `None` if the input integer is not an X coordinate on the curve
to indicate failure. `point_add`, on the other hand, interprets `None` as the
point at infinity. Therefore, without this commit, if the internal `pubkey` is
not a valid X coordinate, the function will not fail, which contradicts the
specification in the "Script validation rules section". Instead, it sets `Q` to
`t*G`.

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