Checking for manage-post permissions before showing sms-conversation (#755)

Author: Angamanga

apps/web-mzima-client/src/app/post/post-details/post-details.component.html

@@ -166,7 +166,12 @@ <h3>{{ field.label }}</h3>
     <app-post-metadata *ngIf="post.id" [post]="post"></app-post-metadata>
   </ng-container>
 </div>
-<app-post-conversation *ngIf="post && post.source === 'SMS'" [post]="post"></app-post-conversation>
+<ng-container *ngIf="isManagePosts">
+  <app-post-conversation
+    *ngIf="post && post.source === 'SMS'"
+    [post]="post"
+  ></app-post-conversation>
+</ng-container>
 <ng-template #spinner>
   <app-spinner *ngIf="isPostLoading" class="spinner"></app-spinner>
   <p