[iOS] RootNavigationController's `viewControllers` are increasing.

[ry-itto]

Kind (Required)

• Bug report (please use the other template)

  Overview (Required)

• Move view from Sidebar, rootViewController?.viewControllers are always increasing. Following is example.

  (lldb) po rootViewController?.viewControllers
  ▿ Optional<Array<UIViewController>>
  ▿ some : 7 elements
  ▿ 0 : <DroidKaigi_2020.FilterViewController: 0x10710a0a0>
  ▿ 1 : <DroidKaigi_2020.FloorMapViewController: 0x10c908ae0>
  ▿ 2 : <DroidKaigi_2020.FilterViewController: 0x10c611ee0>
  ▿ 3 : <DroidKaigi_2020.FloorMapViewController: 0x10c809170>
  ▿ 4 : <DroidKaigi_2020.FilterViewController: 0x10c8088c0>
  ▿ 5 : <DroidKaigi_2020.FloorMapViewController: 0x1073f1f50>
  ▿ 6 : <DroidKaigi_2020.FilterViewController: 0x10c812940>

To resolve this, I think this way(https://github.com/DroidKaigi/conference-app-2020/pull/597/files/7d9e203655abdfa5fe0233d770ece49c62c6120b#diff-34264a1af610b65a3b561894e675d97eR57) is useful.

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