Added missing TextField import

Author: emi-castellano

src/RegionLabel/index.js

@@ -10,7 +10,7 @@ import IconButton from "@material-ui/core/IconButton"
 import Button from "@material-ui/core/Button"
 import TrashIcon from "@material-ui/icons/Delete"
 import CheckIcon from "@material-ui/icons/Check"
-import UndoIcon from "@material-ui/icons/Undo"
+import TextField from "@material-ui/core/TextField"
 import Select from "react-select"
 import CreatableSelect from "react-select/creatable"