application: StateManager: Remove non-required elvis operators

- Warnings observed in Android Studio

w: /builds/e/apps/apps/app/src/main/java/foundation/e/apps/application/model/StateManager.kt: (46, 86): Elvis operator (?:) always returns the left operand of non-nullable type String
w: /builds/e/apps/apps/app/src/main/java/foundation/e/apps/application/model/StateManager.kt: (79, 82): Elvis operator (?:) always returns the left operand of non-nullable type String

Signed-off-by: Aayush Gupta <theimpulson@e.email>