Corrected the UI update

Author: sayantan1410

src/components/TabTraining.vue

@@ -6,16 +6,16 @@
       :label="deterministic.description"
       :saveKey="deterministic.name"
     />
-    <h2>Choose a Backend</h2>
-    <FormSelect
-      required 
-      :saveKey="backend.name"
-      :label="backend.description"
-      :options="backend.options"
-    />
     <h2 class="training">Distributed Training (NCCL backend)</h2>
     <FormCheckbox label="Use distributed training" saveKey="use_dist" />
     <div v-show="store.config.use_dist">
+      <h2>Choose a Backend</h2>
+      <FormSelect
+        required 
+        :saveKey="backend.name"
+        :label="backend.description"
+        :options="backend.options"
+      />
       <FormRadio :options="[launch, spawn]" saveKey="dist" defaultV="launch" />
       <FormInput
         :label="nproc_per_node.description"