Fix MTS_DRAGONFLY_F413RH drag and drop failure
Fix MTS_DRAGONFLY_F413RH drag and drop failure

When manually flashing an application binary to the MULTITECH drive, a FAIL.TXT
file is produced with the following info:
“The application file format is unknown and cannot be parsed and/or processed”.

mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed