Plain text output of describe command look incorrect #346

What steps did you take:
When the annotation in ImagesLock contains yaml the text output of the describe command is incorrectly indented.

Let us assume we have the following ImagesLock

---
apiVersion: imgpkg.carvel.dev/v1alpha1
images:
- annotations:
    kbld.carvel.dev/id: index.docker.io/dkalinin/k8s-simple-app:latest
    kbld.carvel.dev/origins: |
      - resolved:
          tag: latest
          url: index.docker.io/dkalinin/k8s-simple-app:latest
  image: index.docker.io/dkalinin/k8s-simple-app@sha256:4c8b96d4fffdfae29258d94a22ae4ad1fe36139d47288b8960d9958d1e63a9d0
kind: ImagesLock

When we execute imgpkg push -b localhost:5000/test -f basic-step-2 the bundle is pushed to the registry

What happened:

When we execute imgpkg describe -b localhost:5000/test@sha256:3cd8f0d917a92fafeef2d44eb63195d5351c35cf46b8b7448cb126c7d68c6291 this is the output

Bundle SHA: sha256:3cd8f0d917a92fafeef2d44eb63195d5351c35cf46b8b7448cb126c7d68c6291

Images:
  - Image: index.docker.io/dkalinin/k8s-simple-app@sha256:4c8b96d4fffdfae29258d94a22ae4ad1fe36139d47288b8960d9958d1e63a9d0
    Type: Image
    Origin: index.docker.io/dkalinin/k8s-simple-app@sha256:4c8b96d4fffdfae29258d94a22ae4ad1fe36139d47288b8960d9958d1e63a9d0
    Annotations:
      kbld.carvel.dev/id: index.docker.io/dkalinin/k8s-simple-app:latest
      kbld.carvel.dev/origins: - resolved:
    tag: latest
    url: index.docker.io/dkalinin/k8s-simple-app:latest


Succeeded

What did you expect:
The output should be correctly indented

Bundle SHA: sha256:3cd8f0d917a92fafeef2d44eb63195d5351c35cf46b8b7448cb126c7d68c6291

Images:
  - Image: index.docker.io/dkalinin/k8s-simple-app@sha256:4c8b96d4fffdfae29258d94a22ae4ad1fe36139d47288b8960d9958d1e63a9d0
    Type: Image
    Origin: index.docker.io/dkalinin/k8s-simple-app@sha256:4c8b96d4fffdfae29258d94a22ae4ad1fe36139d47288b8960d9958d1e63a9d0
    Annotations:
      kbld.carvel.dev/id: index.docker.io/dkalinin/k8s-simple-app:latest
      kbld.carvel.dev/origins: - resolved:
                                   tag: latest
                                   url: index.docker.io/dkalinin/k8s-simple-app:latest


Succeeded

Anything else you would like to add:
We are using the IndentingUI to automatically indent our output but maybe in this case we need to use some static Prefix or something similar

Environment:

• imgpkg version (use imgpkg --version): v0.26.0
• Docker registry used (e.g. Docker HUB): NA
• OS (e.g. from /etc/os-release): MacOS

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