Upgrade to new form binder

mobile/src/WorkItem/WorkItem.js

@@ -64,6 +64,10 @@ export class WorkItem extends React.Component {
       isValid: (r, v) => v !== "",
       isReadOnly: true,
       alwaysGet: true,
+      initValue: null,
+      pre: (v) =>
+        v !== null && formatLatLng(v.coordinates[1], v.coordinates[0]),
+      post: (v) => parseLatLng(v),
     },
     address: {
       isValid: true,
@@ -105,10 +109,10 @@ export class WorkItem extends React.Component {
         .getWorkItem(id)
         .then((workItem) => {
           if (workItem) {
-            const [lng, lat] = workItem.location.coordinates
+            const [longitude, latitude] = workItem.location.coordinates
             const region = {
-              latitude: lat,
-              longitude: lng,
+              latitude,
+              longitude,
               latitudeDelta: 0.01,
               longitudeDelta: 0.01,
             }
@@ -119,7 +123,6 @@ export class WorkItem extends React.Component {
               this.goToRegion = region
             }
 
-            workItem.location = formatLatLng(lat, lng)
             this.setState({
               binder: new FormBinder(workItem, WorkItem.bindings),
             })
@@ -158,9 +161,7 @@ export class WorkItem extends React.Component {
   @autobind
   handleDonePress() {
     const { binder } = this.state
-    let obj = binder.getModifiedFieldValues()
-
-    obj.location = parseLatLng(obj.location)
+    let obj = binder.getmodifiedBindingValues()
 
     if (!obj._id) {
       api