Bugfix: Submit functionality on the study filter

- Moved the interaction into its own scope
- Added preventDefault() on #studie-form keypress/keydown/keyup + enter

Signed-off-by: Kenneth Dahlstrøm <kenneth@keda.no>
Merge branch 'hotfix/v3.1.2'

* hotfix/v3.1.2:
  Bugfix: Submit functionality on the study filter