Fix typedInput bug

[kazuhitoyokoi]

Types of changes

I fixed #23.

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

I added conditions to exclude typedInput pulldown menu when swagger definition has enum in parameter.

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[coveralls]

Coverage remained the same at 76.821% when pulling 30edb7d on kazuhitoyokoi:master into 99e7adc on node-red:master.

[coveralls]

Coverage remained the same at 76.821% when pulling 30edb7d on kazuhitoyokoi:master into 99e7adc on node-red:master.