Make ← 🍔 when the screen can go by navigation drawer

[takahirom]

Kind (Required)

• Other

  Overview (Required)

• I asked the designer. We can fix it

• We can fix here. very easy

• https://github.com/DroidKaigi/conference-app-2019/blob/master/frontend/android/src/main/java/io/github/droidkaigi/confsched2019/ui/MainActivity.kt#L110

[sobaya-0141]

:raising_hand_man:

[takahirom]

Thanks! Assigned 👍