Fix building edit details on props change

- EditForm owns form state
- fully uncontrolled component
- when props change (e.g. when clicking on another building) the
  component should completely re-render

app/src/frontend/building/building-edit.tsx

@@ -32,6 +32,7 @@ const BuildingEdit = (props) => {
     return (
         <Sidebar>
             <EditForm
+                key={props.building_id}  // provide key so that React re-creates if props change
                 {...section}
                 {...props}
                 cat={cat}

app/src/frontend/building/building-view.tsx

@@ -29,9 +29,7 @@ const BuildingView = (props) => {
     return (
         <Sidebar>
             <DataSection
-                key={section.slug}
                 cat={cat}
-                building_id={props.building_id}
                 {...section}
                 {...props}
             />