message: feat(protocol-designer): disconnect well selection modal from hovered step state
  Well selection modal well contents are now only correlated with the currently selected step (the one
  being edited)
  Closes
diff: @@ -119,7 +119,7 @@ function mapStateToProps (state: BaseState, ownProps: OP): SP {
  const labware = labwareId && allLabware && allLabware[labwareId]
  const allWellContentsForSteps = wellContentsSelectors.allWellContentsForSteps(state)
  - const stepId = steplistSelectors.getActiveItem(state).id
  + const stepId = steplistSelectors.getSelectedStepId(state)
  // TODO: Ian 2018-07-31 replace with util function, "findIndexOrNull"?
  const orderedSteps = steplistSelectors.orderedSteps(state)
  const timelineIdx = orderedSteps.findIndex(id => id === stepId)
  