Adjust fancy_time for dst-to-standard change
Adjust fancy_time for dst-to-standard change

Fixes this bug:
```sh
 FAIL["test_fancy_time", #<Minitest::Reporters::Suite:0x000055db6acfa940 @name="TimeExtensionsTest">, 2.8948509150000064]
 test_fancy_time#TimeExtensionsTest (2.89s)
        Expected: "last week, 2021-03-10"
          Actual: "6 days ago, 2021-03-10"
        test/models/time_extensions_test.rb:98:in `assert_fancy_time'
        test/models/time_extensions_test.rb:87:in `test_fancy_time'
```

Delivers https://www.pivotaltracker.com/story/show/177378817

MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer