[BUG] Cannot parse file with when -> simple -> expression , force to use when -> simple and directly provide the String

[apupier]

Describe the bug

Cannot parse file with when -> simple -> expression , force to use when -> simple and directly provide the String

To Reproduce
Steps to reproduce the behavior:

1. Go to source editor and paste:

- route:
    id: route-3893
    from:
      uri: 'timer:'
      steps:
      - choice:
          when:
          - simple:
              expression: condition1
            steps:
            - log:
                message: reproducer

2. Click onSync
3. The choice is missing
   In more complex case, the full route might not be displayed (but not found simple reproducer)

Expected behavior
A clear and concise description of what you expected to happen.

Logs

2023-09-18 09:24:50,603 ERROR [io.kao.bac.cam.mod.dep.kam.ste.FlowStepDeserializer] (executor-thread-2) Error trying to deserialize step: Cannot deserialize value of type `java.lang.String` from Object value (token `JsonToken.START_OBJECT`)
 at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.kaoto.backend.camel.model.deployment.kamelet.step.ChoiceFlowStep["choice"]->io.kaoto.backend.camel.model.deployment.kamelet.step.choice.SuperChoice["when"]->java.util.ArrayList[0]->io.kaoto.backend.camel.model.deployment.kamelet.step.choice.Choice["simple"])

Environment (please complete the following information):

• OS:
• Output of the mvn -version` command
• Kaoto Version [e.g. 1.0]

Additional context
Add any other context about the problem here.