fix(appconfig): returns correct value on details

[ArtificialOwl]

fixing 2 issues:

• --sensitive/--no-sensitive were not well processed when running occ config:app:set
• getDetails() now returns correct (decrypted) value on sensitive data

Before

$ ./occ config:app:set myapp key2 --value 12343cc --sensitive 
Config value 'key2' for app 'myapp' is now set to '$AppConfigEncryption$71598bcf15f456ba7d37e4a80b04baa4|e8b8d16786364e91d65333c2456919c5|55769ff0d438c6fb261b70a7c211ab899c88cce9b472b5efe42e98db7abfe1c59900bd60a111769935bccedb7fc1ec9f1d66ba66d9ee38a13de8730a119826ba|3', stored as string in fast cache

After

$ ./occ config:app:set myapp key2 --value 12343cc --sensitive 
Config value 'key2' for app 'myapp' is now set to '12343cc', stored as string in fast cache

Also, when displaying details

Before

$ ./occ config:app:get myapp key2  --details 
  - app: myapp
  - key: key2
  - value: $AppConfigEncryption$f7caf4b86c21e1a4c6d8558ac031e71d|dfb2aafbc1390e938f71fed742527cf1|4c7622db35fc58e4ed620324ad2a0d16c19569cc7adb5099cb971f889217539423b9297bdbff5ce38ca57e688b575264c2bbe96442b7820944fe1bd7918eabdb|3
  - type: string
  - lazy: false
  - sensitive: true

After

$ ./occ config:app:get myapp key2  --details 
  - app: myapp
  - key: key2
  - value: 12343cc
  - type: string
  - lazy: false
  - sensitive: true

[ArtificialOwl]

/backport to stable29