Change multi to sweep.

src/bin/main_gui.rs

@@ -41,7 +41,7 @@ async fn main() {
     let data_frequency_clone = app.data_frequency.clone();
 
     let periods_per_dft = app.periods_per_dft.clone();
-    let periods_per_dft_multi = app.periods_per_dft_multi.clone();
+    let periods_per_dft_sweep = app.periods_per_dft_sweep.clone();
 
     let gui_logging_enabled = app.gui_logging_enabled.clone();
 
@@ -61,7 +61,7 @@ async fn main() {
             connected_clone,
             data_frequency_clone,
             periods_per_dft,
-            periods_per_dft_multi,
+            periods_per_dft_sweep,
             gui_logging_enabled,
             log_tx_clone,
         ));