Add button type to the adding SSH key button

[kazuhitoyokoi]

Types of changes

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

Proposed changes

The project feature dialog has the same issue as #3788.

After pressing the enter key in the above area, the UI to add the SSH key emerges incorrectly.

In this pull request, I added the button type into the button to avoid the issue.

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/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 increased (+0.03%) to 68.373% when pulling 745607b on kazuhitoyokoi:master-fixbutton4addsshkey into a5d7f7a on node-red:master.

[kazuhitoyokoi]

I found the same issues in another project feature dialog. Therefore, I added the commit to fix it.

[kazuhitoyokoi]

I added the additional commit to fix the same issues in node properties. Some fixes had been reported in #3780.

complete, catch, and status node: UI showed "Click nodes to select" notification dialog.
function node: UI opened JavaScript editor.

[kazuhitoyokoi]

@knolleary Thank you. Could you add the backport-2.x tag to this pull request? I think that the last commit for core codes is a common problem.