Stale mDNS data used to flash device using Wi-Fi

[jurgelenas]

Posting bug report from discord:

    Using ExpressLRS Configurator on my PC
    Using my normal presets, with my TX16S on WIFI, I flashed ELRS 3.5.2 - no issue

2a.  My TX16s IP address has a DHCP reservation of 192.168.25.200.

    I powered off and back on my TX16S after updating the LUA script and confirmed it was all working fine on 3.5.2


    Turned OFF my TX16S and fired up a RP2 without connected TX and let it fail into WIFI mode.
    WebBrowsed to RP2 to confirm its online.  192.168.25.211  - confirmed.
    Using ExpressLRS Configurator on my PC, I reselected

6a. RadioMaster Type
6b. RadioMaster RP2
6c. Confirmed the device "Drop down" had detected and saw my RP2 and not my TX16S - confirmed
6c. As the drop down showed my RP2 details, including correct IP address for the RP2 - I DID NOT HIT SELECT or DROP DOWN.

    Hit Flash - and it failed,   Checking logs - shows it was still trying to flash the old TX IP 192.168.25.200 (not .211 for the RP2) - but from what I can see, with the correct RP2 build etc.


    Tried again, this time using the "SELECT" button and this flashed and worked fine.