[SDCOSMO-2274] Scenario parameters are not saved

During patch run template id is not ensured to be present in query,
so comparing to query value which can be null resulting in no run template to be found.
Instead using the existing in store value ensure that we have the run template to look for.

Author: neomatamune

scenario/src/main/kotlin/com/cosmotech/scenario/service/ScenarioServiceImpl.kt

@@ -758,7 +758,7 @@ internal class ScenarioServiceImpl(
             solutionService.getVerifiedSolution(organizationId, it)
           }
       val runTemplate =
-          solution?.runTemplates?.find { runTemplate -> runTemplate.id == scenario.runTemplateId }
+          solution?.runTemplates?.find { runTemplate -> runTemplate.id == existingScenario.runTemplateId }
       val runTemplateParametersIds =
           solution
               ?.parameterGroups