Fixes unnamed crash cluster

app/src/main/java/de/kuschku/quasseldroid/ui/clientsettings/whitelist/WhitelistFragment.kt

@@ -109,10 +109,12 @@ class WhitelistFragment : SettingsFragment(), Changeable,
     handler.post {
       whitelist = Whitelist(database.validityWhitelist().all(), database.hostnameWhitelist().all())
       whitelist?.let {
+        activity?.runOnUiThread {
           certificateAdapter.list = it.certificates
           hostnameAdapter.list = it.hostnames
         }
       }
+    }
     return view
   }