Fix refreshing SwBuildId last set time stamps
Fix refreshing SwBuildId last set time stamps

The problem was that periodic polling of the attribute was triggered endlessly because the last query time stamp was never updated.

lightNode->setSwBuildId(str) was removed because item->setValue(str) does the same and faster since item is already known.
dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin