Fix more warnings

libraries/matrix/src/main/java/io/element/android/x/matrix/RoomWrapper.kt

@@ -1,15 +0,0 @@
-package io.element.android.x.matrix
-
-import android.util.Log
-import org.matrix.rustcomponents.sdk.Client
-import org.matrix.rustcomponents.sdk.Room
-
-class RoomWrapper(
-    private val client: Client
-) {
-    fun getRoom(roomId: String): Room? {
-        val rooms = client.rooms()
-        Log.d(LOG_TAG, "We have ${rooms.size} rooms")
-        return rooms.firstOrNull { it.id() == roomId }
-    }
-}

libraries/matrix/src/main/java/io/element/android/x/matrix/util/CallbackFlow.kt

@@ -1,6 +1,3 @@
-@file:OptIn(ExperimentalCoroutinesApi::class)
-
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.channels.ProducerScope
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.callbackFlow