STM32F769i: Not possible to flash thermo demo from Creator

When configuring thermo demo for STM32F769i creator, both the thermo_big and thermo_small targets get generated.

Then, when trying to run on target, there'll be the following error:

15:39:55: Starting /usr/bin/cmake --build . --target flash_thermo...
ninja: error: unknown target 'flash_thermo'

Instead of flashing thermo_big or thermo_small, it tries to flash the non-existent binary "thermo".

Maybe thermo_small should be disabled for STM32F769i-discovery, since it's anyway too small for the display.