fix fragility toggle

mapControl was declared as a const instead of a var, which prevented switchMode() from working properly.

This fixes that by using var rather than const, and also moves the Controls and initial layer declarations above switchMode() so we don't have to rely on hoisting to use variables declared later.

Fixes #16

website/load-map.js

@@ -319,6 +319,24 @@ Promise.all([boundaries, branchesCsv, ikcCsv, mechanics, nslaBranches])
     setGeneral()
   }
 
+  // add control layers
+  var mapControl = L.control.layers(
+    baseMaps, 
+    overlayMaps, 
+    { "collapsed" : false }
+  ).addTo(map);
+
+  // scale
+  L.control.scale().addTo(map);
+
+  // info boxes
+  const infoBoxes = {
+    branches: L.control(),
+    fines: L.control(),
+    loanPeriod: L.control(),
+    serviceInfo: L.control({position: 'topleft'})
+  }
+
   // switching mode between standard and fragile
   function switchMode() {
     if (sessionStorage.getItem('mapMode') === 'fragile') {
@@ -340,24 +358,6 @@ Promise.all([boundaries, branchesCsv, ikcCsv, mechanics, nslaBranches])
 
   modeButton.addEventListener('click', switchMode, false);
 
-  // add control layers
-  const mapControl = L.control.layers(
-      baseMaps, 
-      overlayMaps, 
-      { "collapsed" : false }
-    ).addTo(map);
-
-  // scale
-  L.control.scale().addTo(map);
-
-  // info boxes
-  const infoBoxes = {
-    branches: L.control(),
-    fines: L.control(),
-    loanPeriod: L.control(),
-    serviceInfo: L.control({position: 'topleft'})
-  }
-
   function getFinesColor(f) {
     return  f == 'no' ? '#4dac26' :
             f == 'yes' ? '#d01c8b' :