Insteon: Prevent Error Cause by Using old Read Table A Defintion

Using an old definition such as:
```
INSTEON_MOTIONSENSOR, DE.AD.BE, Garage_Motion, MotionSensors|hidden, PLM, 1001
```
Would cause an error, as discovered by @CityDweller.  This fixes that issue.
Merge pull request #466 from krkeegan/insteon_def_fix

Insteon: Prevent Error Cause by Using old Read Table A Defintion