Merge pull request #351 from adafruit/fix-sendStringDescriptor #360

Job	Run time
build (metro_m0)	1m 51s
build (hallowing)	1m 45s
build (circuitplayground_m0)	1m 44s
build (metro_m4)	1m 52s
build (pybadge_m4)	1m 53s
build (pygamer_m4)	1m 53s
build (hallowing_m4)	1m 53s
build (pyportal_m4)	1m 52s
build (pyportal_m4_titano)	1m 49s
build (feather_m4_can)	1m 49s
build (metro_m0:usbstack=tinyusb)	3m 24s
build (metro_m4:speed=120,usbstack=tinyusb)	3m 30s
	25m 15s

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