Insteon: Remove Unnecessary Test of Data3 Inside Has_Link Routine

The linkkey contains the data3 value.  If the linkkey matches there is no need to check the data3 value.

For the PLM data3 is currently ignored because MH sets data3 on responder links to 00, while manually linking sets it to the device's firmware.
Merge branch 'fix_insteon_has_link' into InsteonIP
Insteon: Clear Array of Sync Failures When Starting a New Sync
Merge branch 'fix_insteon_has_link' into InsteonIP
Insteon: Clear Delete Failure Array When Starting Delete Orphans
Merge branch 'fix_insteon_has_link' into InsteonIP