Remove unused(?) data_dialog form element type.

[jmchilton]

I was looking at a typing error and I decided the code just wouldn't work as is and I tried to find how it was used and I could not find anything. I'm guessing it is code that has been replaced with an alternative implementation strategy. Anybody know?

After these changes both of these greps are empty.

grep -r data_dialog client/src
grep -r data_dialog lib

How to test the changes?

(Select all options that apply)

• This is a refactoring of components with existing test coverage.

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[davelopez]

It does look unused indeed 👍