other: don't collect time series data in basic mode (#1669)

Ideally I also introduce a way to ensure basic mode widgets straight up
cannot accidentally access ts data, but this works for now.

src/app/data/store.rs

@@ -88,7 +88,9 @@ impl StoredData {
             }
         }
 
-        self.timeseries_data.add(&data);
+        if !settings.use_basic_mode {
+            self.timeseries_data.add(&data);
+        }
 
         if let Some(network) = data.network {
             self.network_harvest = network;