quality : move canUnban logic to the permission class

features/roommembermoderation/api/src/main/kotlin/io/element/android/features/roommembermoderation/api/RoomMemberModerationPermissions.kt

@@ -13,6 +13,9 @@ data class RoomMemberModerationPermissions(
     val canKick: Boolean,
     val canBan: Boolean,
 ) {
+    // Unban requires both kick and ban permission instead of a dedicated unban permission
+    val canUnban = canBan && canKick
+
     companion object {
         val DEFAULT = RoomMemberModerationPermissions(
             canKick = false,