[Time Conductor] Reformat expression in template

...to use less line width, and to exhibit more normal
indentation, per code review feedback from #475

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

@@ -25,7 +25,9 @@
            ng-model="textValue"
            ng-blur="restoreTextValue(); ngBlur()"
            ng-class="{
-                     error: textInvalid || (structure.validate && !structure.validate(ngModel[field]))
+                        error: textInvalid ||
+                            (structure.validate &&
+                                !structure.validate(ngModel[field]))
                      }">
     </input>
     <a class="ui-symbol icon icon-calendar"