fix path to mosquitto.conf

[KTannenberg]

Fixes:

• mosquitto conf broken in dev branch #1125
• Timed out while waiting for the device to (re)connect #1126
• mosquitto settings need adaptions #1045 (potentially)

[KTannenberg]

Just finished flashing couple Teckin SP23's after applying this change locally:

======================================================
Starting smart config pairing procedure
Waiting for the device to install the intermediate firmware
Put device in EZ config mode (blinking fast)
Sending SSID                  vtrust-flash
Sending wifiPassword
Sending token                 00000000
Sending secret                0101
...............
SmartConfig complete.
Resending SmartConfig Packets
........................
IoT-device is online with ip 10.42.42.42
Fetching firmware backup
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1024k  100 1024k    0     0  78352      0  0:00:13  0:00:13 --:--:-- 80481
======================================================
Getting Info from IoT-device
VTRUST-FLASH 1.5
(c) VTRUST GMBH https://www.vtrust.de/35c3/
READ FLASH: http://10.42.42.42/backup
ChipID: 43ae87
MAC: CC:50:E3:43:AE:87
BootVersion: 4
BootMode: normal
FlashMode: 1M DOUT @ 40MHz
FlashChipId: 144068
FlashChipRealSize: 1024K
Active Userspace: user2 0x81000
======================================================
Ready to flash third party firmware!

For your convenience, the following firmware images are already included in this repository:
  Tasmota v9.2.0 (wifiman)
  ESPurna 1.5 (base)

You can also provide your own image by placing it in the /files directory
Please ensure the firmware fits the device and includes the bootloader
MAXIMUM SIZE IS 512KB

Available options:
  0) return to stock
  1) flash espurna.bin
  2) flash tasmota.bin
  q) quit; do nothing
Please select 0-2: 2
Are you sure you want to flash tasmota.bin? This is the point of no return [y/N] y
Attempting to flash tasmota.bin, this may take a few seconds...
Flashed http://10.42.42.1/files/tasmota.bin successfully in 12446ms, rebooting...
Look for a tasmota-xxxx SSID to which you can connect and configure
Be sure to configure your device for proper function!

HAVE FUN!

Without it smartconfig kept timing out:

======================================================
Starting smart config pairing procedure
Waiting for the device to install the intermediate firmware
Put device in EZ config mode (blinking fast)
Sending SSID                  vtrust-flash
Sending wifiPassword
Sending token                 00000000
Sending secret                0101
...............
SmartConfig complete.
Resending SmartConfig Packets
.................................................................................................................
Timed out while waiting for the device to (re)connect
======================================================
Attempting to diagnose the issue...
An ESP82xx based device connected according to your wifi log.
If this is the device you are trying to flash, another issue may be preventing it from flashing.
Otherwise, it could be that the device does not use an ESP82xx or it did not connect.
For additional information, check the *.log files inside the scripts folder.
Please include these logs when opening a new issue on our GitHub issue tracker.
======================================================

[kueblc]

Confirmed working by #850. Thanks for your contribution!