Fix population slider only going halfway (#453)

This is a bug fix for
#449. I
unintentionally broke things by removing the
`filterManager.subscribe()`, meaning we didn't redraw the sliders every
time the slider values changed.

Also removes a double initialization of viewToggle.

src/js/populationSlider.ts

@@ -95,4 +95,10 @@ export function initPopulationSlider(
       updateSlidersUI(filterManager.getState());
     }
   });
+
+  // Also update UI when values change, but only if the filter popup is open.
+  filterManager.subscribe((state) => {
+    if (!filterPopupIsVisible.getValue()) return;
+    updateSlidersUI(state);
+  });
 }

src/js/viewToggle.ts

@@ -50,6 +50,5 @@ export default function initViewToggle(table: Tabulator): ViewStateObservable {
   const viewToggle = new Observable<ViewState>("map");
   viewToggle.subscribe((state) => updateUI(table, state));
   updateOnIconClick(viewToggle);
-  viewToggle.initialize();
   return viewToggle;
 }