webui: dynamic preview button does not work

[mike-hunhoff]

error:

Unsupported Version
Version 6.1.0 is not supported. Please use version 7.0.0 or higher.

[mr-tz]

blocked by mandiant/capa-testfiles#245

[mr-tz]

we can use https://github.com/mandiant/capa-testfiles/blob/master/rd/0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json.gz now