PluginManagerTest: fix number of plugins
PluginManagerTest: fix number of plugins

Earthwings/marble,Earthwings/marble,oberluz/marble,AndreiDuma/marble,tzapzoor/marble,tzapzoor/marble,tucnak/marble,quannt24/marble,adraghici/marble,rku/marble,rku/marble,quannt24/marble,tucnak/marble,tucnak/marble,tzapzoor/marble,Earthwings/marble,quannt24/marble,rku/marble,Earthwings/marble,oberluz/marble,tucnak/marble,tzapzoor/marble,David-Gil/marble-dev,probonopd/marble,rku/marble,AndreiDuma/marble,adraghici/marble,AndreiDuma/marble,AndreiDuma/marble,tzapzoor/marble,probonopd/marble,probonopd/marble,probonopd/marble,quannt24/marble,probonopd/marble,oberluz/marble,tzapzoor/marble,utkuaydin/marble,oberluz/marble,utkuaydin/marble,tzapzoor/marble,quannt24/marble,David-Gil/marble-dev,David-Gil/marble-dev,tucnak/marble,utkuaydin/marble,adraghici/marble,rku/marble,tzapzoor/marble,adraghici/marble,adraghici/marble,tucnak/marble,David-Gil/marble-dev,AndreiDuma/marble,Earthwings/marble,Earthwings/marble,utkuaydin/marble,oberluz/marble,oberluz/marble,probonopd/marble,utkuaydin/marble,AndreiDuma/marble,quannt24/marble,David-Gil/marble-dev,quannt24/marble,adraghici/marble,utkuaydin/marble,rku/marble,tucnak/marble,David-Gil/marble-dev,probonopd/marble