Stale mDNS data used to flash device using Wi-Fi

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.
```