Clean up SloFactory code

theodolite/src/main/kotlin/rocks/theodolite/kubernetes/slo/SloFactory.kt

@@ -7,18 +7,15 @@ import rocks.theodolite.kubernetes.model.KubernetesBenchmark.Slo
 class SloFactory {
 
     fun createSlos(execution: BenchmarkExecution, benchmark: KubernetesBenchmark): List<Slo> {
-        var benchmarkSlos = benchmark.slos
-        var executionSlos = execution.slos
+        val resultSlos = benchmark.slos.toMutableList()
 
-        for(executionSlo in executionSlos) {
-            for(i in 0 until benchmarkSlos.size) {
-                if(executionSlo.name == benchmarkSlos[i].name && executionSlo.properties != null) {
-                    for (executionProperty in executionSlo.properties!!) {
-                        benchmarkSlos[i].properties[executionProperty.key] = executionProperty.value
+        for (executionSlo in execution.slos) {
+            for (resultSlo in resultSlos) {
+                if (executionSlo.name == resultSlo.name && executionSlo.properties != null) {
+                    resultSlo.properties.putAll(executionSlo.properties!!)
                 }
             }
         }
-        }
-        return benchmarkSlos
+        return resultSlos
     }
 }
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