Check for scrollbarsMissing on rule list pane resize

To reproduce:
- Set the page[limit] to something low, like 3
- Ensure there are at least 30 rules in the storage db
- Load the rule editor
- Resize the window so that is small
- Unfilter
- Wait for the list of rules to load
- Resize the window bigger

Notice that additional rules are not loaded to fill the rule list pane and there are no scrollbars to allow loading additional rules

AC:
When a rule list pane resize occurs, the left pane size needs to be recalculated to ensure enough rules are loaded to fill the scrollpane.