[backport core/1.35] Support fixed seed in vue (#7656)

Backport of #7510 to `core/1.35`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7656-backport-core-1-35-Support-fixed-seed-in-vue-2cf6d73d36508160b8daf48fc09ac141)
by [Unito](https://www.unito.io)

Co-authored-by: AustinMroz <austin@comfy.org>

src/renderer/extensions/vueNodes/widgets/components/NumberControlPopover.vue

@@ -150,7 +150,12 @@ const handleEditSettings = () => {
           <ToggleSwitch
             :model-value="isActive(option.mode)"
             class="flex-shrink-0"
-            @update:model-value="handleToggle(option.mode)"
+            @update:model-value="
+              (v) =>
+                v
+                  ? handleToggle(option.mode)
+                  : handleToggle(NumberControlMode.FIXED)
+            "
           />
         </div>
       </div>