win: hid_get_input_report: Correct number of bytes_returned (#232)

Fixes: #229

This originally tested/confirmed by @JoergAtGithub and @mcuee.
And confirmed the expected behavior by Tim Roberts https://sourceforge.net/p/libusb/mailman/message/37303650/.

windows/hid.c

@@ -930,11 +930,6 @@ int HID_API_EXPORT HID_API_CALL hid_get_input_report(hid_device *dev, unsigned c
 		return -1;
 	}
 
-	/* bytes_returned does not include the first byte which contains the
-	   report ID. The data buffer actually contains one more byte than
-	   bytes_returned. */
-	bytes_returned++;
-
 	return bytes_returned;
 #endif
 }