gitignore: Add mconf-idf.exe and conf-idf.exe
gitignore: Add mconf-idf.exe and conf-idf.exe

Problem since f6cd55d2ac

Closes https://github.com/espressif/esp-idf/issues/2751

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf