Insteon/X10: Skip Calling Set_Receive on PLM

Not clear on what this does for a general X10 interface, but the Insteon PLM has no state, therefore it has no set_receive command.  The safest thing to do is just to skip this call for Insteon PLMs.
Insteon/X10: Fix absent Parenthesis
Merge pull request #435 from krkeegan/fix_issue_434

Insteon/X10: Skip Calling Set_Receive on PLM