Ensure that `mini_magick` is absent after `rails new` with `--skip-active-storage`
Ensure that `mini_magick` is absent after `rails new` with `--skip-active-storage`

Remove redundant assertions of an absence of `mini_magick` in `Gemfile`
since `bin/rails app:update` does not update Gemfile.
This assertions was added by 4a835aa3236eedb135ccf8b59ed3c03e040b8b01,
after reviewing of https://github.com/rails/rails/pull/32049 i realized
that assertions are redundant.

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