Fix tplink not updating IP from DHCP discovery and discovering twice

[bdraco]

Proposed change

We only called format_mac on the mac address if we connected to the device during entry creation. Since the format of the mac address from DHCP discovery did not match the format saved in the unique id, the IP would not get updated and a second discovery would appear

Thankfully the creation path does format the mac so we did not create any entries with an inconsistantly formatted unique id

fixes #110460

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[home-assistant]

Hey there @rytilahti, @TheGardenMonkey, @sdb9696, mind taking a look at this pull request as it has been labeled with an integration (tplink) you are listed as a code owner for? Thanks!

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[bdraco]

thanks