[Time Conductor] Restore last valid values

Restore last valid values on blur, in a date-time entry field.

platform/commonUI/general/res/templates/controls/datetime-field.html

@@ -2,7 +2,7 @@
       ng-controller="DateTimeFieldController">
     <input type="text"
            ng-model="textValue"
-           ng-blur="structure.submit()"
+           ng-blur="restoreValue(); structure.submit()"
            ng-class="{ error: textInvalid }">
     </input>
     <a class="ui-symbol icon icon-calendar"