Interactive Mode with frontendModule="decoupled" not working

### Expected Behaviour

Interactive Mode with frontendModule="decoupled" is not working. It's working fine when passing `-D frontendModule="decoupled"` option

### Actual Behaviour

With interactive mode, message
`Define value for property 'frontendModule' (should match expression '^(none|general|angular|react)$') general`
is prompted but with no decoupled option.

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce

1.) `mvn org.apache.maven.plugins:maven-archetype-plugin:3.2.1:generate -D archetypeGroupId=com.adobe.aem -D archetypeArtifactId=aem-project-archetype -D archetypeVersion=41 -D appTitle="my site" -D appId="mysite" -D groupId="com.mysite"`
2.) When beeing asked for `Confirm properties configuration` reply with `n`
3.) Use default properties apart from frontendModule

Start by reproducing the issue with the Maven archetype-plugin:3.2.1:generate command and compare interactive property handling with the -D frontendModule="decoupled" path. Trace where the frontendModule choices are defined and verify that interactive mode offers decoupled and accepts it while generating the project.

Written by the indexing model from the issue text.