fix freemium trial btn color

pages/freemium/index.vue

@@ -287,7 +287,7 @@ onUnmounted(() => {
 }
 .btn_trial {
   height: 55px;
-  background-color: rgb(var(--v-theme-x-create-btn));
+  background-color: rgb(var(--v-theme-standout));
   color: #000;
 
   span {