When PA plugin starting up, it always re-write performance_analyzer_enabled.conf file

[vietic]

The method initPerformanceAnalyzerStateFromConf inside of the class PerformanceAnalyzerController is always end-up to call the method updatePerformanceAnalyzerState that always re-writes the performance_analyzer_enabled.conf file even though the file had same value before.

The plugin should have to write the file when needed.