Previously some tests had to manually create dependencies (instead of
injecting them) because the dependency required the `TestScope`
`CoroutineScope` as one of its dependencies.
Resolve this with a `FakeCoroutineScopeModule` that provides `TestScope`
as `@ApplicationScope`. The tests can now inject their dependencies,
which will use `TestScope`.
To inject `AccountPreferenceDataStore` it has been updated to use the
current active account when reading or writing preferences.
aaf8cf57f3