Enforce HS disabling E2EE in DM creation too (Element Pro) (#7292)

This part was missing from the implementation of this Element Pro feature, which incorrectly only applied to rooms.

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClient.kt

@@ -430,10 +430,10 @@ class RustMatrixClient(
         }
     }
 
-    override suspend fun createDM(userId: UserId): Result<RoomId> {
+    override suspend fun createDM(userId: UserId, isEncrypted: Boolean): Result<RoomId> {
         val createRoomParams = CreateRoomParameters(
             name = null,
-            isEncrypted = true,
+            isEncrypted = isEncrypted,
             isDirect = true,
             visibility = RoomVisibility.Private,
             preset = RoomPreset.TRUSTED_PRIVATE_CHAT,

libraries/matrix/impl/src/test/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClientTest.kt

@@ -132,7 +132,7 @@ class RustMatrixClientTest {
             client = FakeFfiClient(createRoomResult = createRoomLambda)
         )
 
-        client.createDM(A_USER_ID)
+        client.createDM(userId = A_USER_ID, isEncrypted = true)
 
         createRoomLambda.assertions().isCalledOnce()
         assertThat(createParameters?.historyVisibilityOverride).isEqualTo(RoomHistoryVisibility.Invited)