Fix bug with going to a previous step after editing actions

We never send our actions data back down to the actions form, so it was
lost if you went to a previous step.

Since the actions UI still had any connectors you created, you merely
had to reselect the throttle and the connector, but this prevents you
from having to do that.

x-pack/plugins/security_solution/public/detections/pages/detection_engine/rules/create/index.tsx

@@ -422,6 +422,7 @@ const CreateRulePageComponent: React.FC = () => {
             <EuiHorizontalRule margin="m" />
             <StepRuleActions
               addPadding={true}
+              defaultValues={stepsData.current[RuleStep.ruleActions].data}
               isReadOnlyView={isStepRuleInReadOnlyView[RuleStep.ruleActions]}
               isLoading={isLoading || loading}
               setForm={setStepsForm}