monitor: remove comma from monitor description (#3996)

this allows for monitor specific rules to work on monitor with comma on
their description

fixes #2457

src/helpers/Monitor.hpp

@@ -43,6 +43,7 @@ class CMonitor {
     float           scale           = 1;
 
     std::string     szName = "";
+    std::string     szDescription = "";
 
     Vector2D        vecReservedTopLeft     = Vector2D(0, 0);
     Vector2D        vecReservedBottomRight = Vector2D(0, 0);