KST-23: change when sorting button appears

src/app/core/service-detail/service-detail.component.html

@@ -81,11 +81,12 @@
       <h5 class='base_container_header'>
         Története
       </h5>
-        <button class='btn' *ngIf='currentHistoryOrderState === historyOrderState.Descending && !isLoggedIn'
+      <div>
+        <button class='btn mt-auto' *ngIf='currentHistoryOrderState === historyOrderState.Descending && service.history.length >=2'
           (click)='toggleHistoryOrder(historyOrderState.Ascending)'>
           ↑
         </button>
-        <button class='btn' *ngIf='currentHistoryOrderState === historyOrderState.Ascending && !isLoggedIn'
+        <button class='btn' *ngIf='currentHistoryOrderState === historyOrderState.Ascending && service.history.length >= 2'
           (click)='toggleHistoryOrder(historyOrderState.Descending)'>
           ↓
         </button>
@@ -94,6 +95,7 @@
           <fa-icon [icon]='faPlusSquare'></fa-icon>
         </button>
       </div>
+    </div>
 
 
     <div class='bg-light p-3 mb-3'