Response Correlation Viewer: Clearing data should clear plots

[valentin-krasontovitsch]

Describe the bug
When clearing the chosen ensembles, responses, and parameters, the plots should return to a blank state.

To Reproduce
Steps to reproduce the behavior:

1. Open webviz-ert with some data (e.g. in ert, test-data/local/snake_oil)
2. Navigate to the response correlation viewer
3. Select an ensemble, and a few responses and parameters
   4a. Deselect all responses, parameters, and ensembles OR
   4b. Click on the "Refresh" button up top
4. The graphs are not returned to a blank state

Expected behavior
All plots should be blank, like when one first visits the response correlation viewer (with no stored data from a previous visit)

Screenshots
before deselection:

after deselection:

expected view:

Desktop (please complete the following information):

• OS: Ubuntu 22.04 "jammy"
• Browser: Google Chrome 102.0.5005.115