fix: remove `remember` from `isEditing` variable

app/src/main/java/com/geeksville/mesh/ui/ChannelFragment.kt

@@ -122,12 +122,11 @@ fun ChannelScreen(viewModel: UIViewModel = viewModel()) {
 
     val channels by viewModel.channels.collectAsStateWithLifecycle()
     var channelSet by remember(channels) { mutableStateOf(channels.protobuf) }
+    val isEditing = channelSet != channels.protobuf
 
     val primaryChannel = ChannelSet(channelSet).primaryChannel
     val channelUrl = ChannelSet(channelSet).getChannelUrl()
 
-    val isEditing by remember(channelSet) { mutableStateOf(channelSet != channels.protobuf) }
-
     val barcodeLauncher = rememberLauncherForActivityResult(ScanContract()) { result ->
         if (result.contents != null) {
             viewModel.setRequestChannelUrl(Uri.parse(result.contents))