Fix unused import.

Author: langleyd

features/roomlist/impl/src/test/kotlin/io/element/android/features/roomlist/impl/RoomListPresenterTests.kt

@@ -63,7 +63,6 @@ import kotlinx.coroutines.test.TestScope
 import kotlinx.coroutines.test.runTest
 import org.junit.Rule
 import org.junit.Test
-import kotlin.time.Duration.Companion.milliseconds
 
 class RoomListPresenterTests {