Fix: Computation of list of counters used in RunSpec

core/src/main/kotlin/se/lth/cs/papicounters/PapiBenchmarkAnalyzer.kt

@@ -26,7 +26,9 @@ interface PapiBenchmarkAnalyzer {
         }
 
         fun counters() : List<PAPICounter> {
-            return features.filterIsInstance<PAPICounter>()
+            val eb = EventSetBuilder()
+            features.accept(eb)
+            return eb.getCounterSet().toList()
         }
     }