Two fixes for #6:

1) Point mode's finish button doesn't do anything yet, so remove it.
   Will replace with markers and make more intuitive next.
2) Save edits when only a form is updated, not geometry.

src/lib/draw/EditMode.svelte

@@ -35,6 +35,9 @@
       return gj;
     });
     let feature = maybeFeature!;
+    // Immediately copy the feature, so that if no geometry edits happen and
+    // only form updates (through $featureProps), the edit is still used.
+    unsavedFeature = JSON.parse(JSON.stringify(feature));
 
     if (feature.geometry.type == "LineString") {
       // TODO Update route-snapper-ts to use Except<route_name> or otherwise pick the important properties

src/lib/draw/point/PointControls.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import { HelpButton } from "$lib/common";
-  import { DefaultButton, SecondaryButton } from "govuk-svelte";
+  import { SecondaryButton } from "govuk-svelte";
   import FixedButtonGroup from "../FixedButtonGroup.svelte";
 
   export let editingExisting: boolean;
@@ -9,8 +9,6 @@
 
 <div style="float: right">
   <FixedButtonGroup>
-    <DefaultButton style="margin-bottom: 0px">Finish</DefaultButton>
-
     <SecondaryButton on:click={cancel} noBottomMargin>Cancel</SecondaryButton>
 
     <HelpButton>