Do not clean DB twice on feature specs
Do not clean DB twice on feature specs

It turns out that we were executing `DatabaseCleaner.clean` on two
`after(:each)` blocks. One for all specs and another one for `js: true`
specs. As a result feature specs were hitting both which slows them down
considerably.

On my machine this changes consistently saves 2sec on
`spec/features/consumer/shops_spec.rb` but chances are it has an
accumulative effect when run on the whole test suite.

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