Specify what should happen when both first-run page warnings are shown at the same time
In https://gitlab.com/eyeo/adblockplus/adblockplusui/issues/68 we added a warning to inform users about data corruption. In the review the decision was made not to show the existing warning (about filter lists being reinitialized) when we show the data corruption warning.
Therefore we should now update the spec accordingly to reflect that behavior.