Make feature flag work for unit tests

[joshmarinacci]

Currently the simple fees are not loaded by the genesis process because the flag isn't enabled. When the flag is set in unit tests the change is after the genesis process, so the initial simple fees schedule won't get loaded. To fix this we need to do one of the following

• make genesis run after the flag is set.
• force the system to update when the flag is set.
• run the simple fees unit tests in a different environment where the flag is set before genesis happens.