Usb.cpp: Fix typos when unable to disable USB data

If Usb.cpp cannot write a zero value to the USB_DATA_PATH file, display
the message of "Not able to turn off usb connection notification".

Test: refactoring CL. Existing tests still pass.
Bug: 301016122
Change-Id: I0c5b7c4dc5bfe21ba17058536b5014eb5d69d1f3
1 file changed