Fix bugs when adding activity

mobile/src/ui/BoundInput.js

@@ -34,10 +34,10 @@ export class BoundInput extends React.Component {
 
   @autobind
   handleChangeText(newText) {
-    const { binder, name } = this.props
-
-    if (binder) {
-      this.setState(binder.updateFieldValue(name, newText))
+    if (this.props.binder) {
+      this.setState(
+        this.props.binder.updateFieldValue(this.props.name, newText)
+      )
     }
   }