fix for not able to remove "Show on Card"

client/components/sidebar/sidebarCustomFields.jade

@@ -37,7 +37,7 @@ template(name="createCustomFieldPopup")
             each dropdownItems.get
                 input.js-dropdown-item(type="text" value=name placeholder="")
             input.js-dropdown-item.last(type="text" value="" placeholder="{{_ 'custom-field-dropdown-options-placeholder'}}")
-        a.flex.js-field-show-on-card
+        a.flex.js-field-show-on-card(class="{{#if showOnCard}}is-checked{{/if}}")
             .materialCheckBox(class="{{#if showOnCard}}is-checked{{/if}}")
 
             span {{_ 'show-field-on-card'}}
@@ -49,4 +49,4 @@ template(name="createCustomFieldPopup")
 
 template(name="deleteCustomFieldPopup")
     p {{_ "custom-field-delete-pop"}}
-    button.js-confirm.negate.full(type="submit") {{_ 'delete'}}
+    button.js-confirm.negate.full(type="submit") {{_ 'delete'}}