Only show a Matrix ID in the room picker for a direct message

heroes is populated for any room whose name is derived from its members,
not only for direct messages, so a two person room that is not a DM
showed a member's Matrix ID as its subtitle.

Carry isDm on SelectRoomInfo and read the hero only when it is set. The
canonical alias still takes precedence, so nothing changes for a room
that has one.

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectRoomInfoProvider.kt

@@ -31,6 +31,7 @@ fun aSelectRoomInfo(
     canonicalAlias: RoomAlias? = null,
     avatarUrl: String? = null,
     heroes: ImmutableList<MatrixUser> = persistentListOf(),
+    isDm: Boolean = false,
     isTombstoned: Boolean = false,
 ) = SelectRoomInfo(
     roomId = roomId,
@@ -38,5 +39,6 @@ fun aSelectRoomInfo(
     canonicalAlias = canonicalAlias,
     avatarUrl = avatarUrl,
     heroes = heroes,
+    isDm = isDm,
     isTombstoned = isTombstoned,
 )

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/model/SelectRoomInfo.kt

@@ -23,6 +23,7 @@ data class SelectRoomInfo(
     val canonicalAlias: RoomAlias?,
     val avatarUrl: String?,
     val heroes: ImmutableList<MatrixUser>,
+    val isDm: Boolean,
     val isTombstoned: Boolean,
 ) {
     fun getAvatarData(size: AvatarSize) = AvatarData(
@@ -41,5 +42,6 @@ fun RoomInfo.toSelectRoomInfo() = SelectRoomInfo(
     avatarUrl = avatarUrl,
     heroes = heroes,
     canonicalAlias = canonicalAlias,
+    isDm = isDm,
     isTombstoned = successorRoom != null,
 )