app_update: Fix otatool targets
app_update: Fix otatool targets

Fix a regression caused by 6b361d923ce80d6d20cf552e72ac533aab25a77d

Closes https://github.com/espressif/esp-idf/issues/8843

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