Revert IPv4 variable change made in commit 4203be5

[christianboyle]

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What does this PR aim to accomplish?:
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This reverts a prior change that switched ${IPV4_ADDRESS} to ${pi_ip_address} which resulted in PADD displaying the wlan0 address rather than eth0 as it has historically.

The change was not made to other variants within 4203be5, so presumably it was a mistake.

How does this PR accomplish the above?:
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"IPv4:" "${pi_ip_address}"
changes back to:
"IPv4:" "${IPV4_ADDRESS}"

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[DL6ER]

@fullburnen What do you think?

[dschaper]

Can you change the version string to v3.4.1 please?

[christianboyle]

I went ahead and bumped the version on this again after rebasing.

[fullburnen]

Sorry, my email notifications all went to spam for some reason and I just saw the mention.

Yes, it was a mistake copied from elsewhere. Thanks for catching this!