Merge branch '241-fix-active-user-dublication-bug-in-topic-cloud' into 'staging'

fix dublication error, when selecting param alwaysshowinheader do not show...

Closes #241

See merge request arsnova/topic-cloud!143

src/app/components/shared/overlay/active-user/active-user.component.html

-<div class="activityIcon" *ngIf="deviceType&&deviceType==='desktop'" [ngStyle]="{
+<div class="activityIcon" *ngIf="showByComponent" [ngStyle]="{
     'left':left+'px',
     'top':top+'px'
   }" #divElement>

src/app/components/shared/overlay/active-user/active-user.component.ts

@@ -22,6 +22,7 @@ export class ActiveUserComponent implements OnInit,OnDestroy{
   onDestroyListener: (() => void)[]=[];
   onValueChangeListener: ((user: number) => void)[]=[];
   deviceType;
+  showByComponent: boolean;
 
   constructor(
     private activeUserService: ActiveUserService,
@@ -32,9 +33,12 @@ export class ActiveUserComponent implements OnInit,OnDestroy{
 
   ngOnInit(): void{
     if(this.deviceType&&(this.deviceType==='mobile'||this.alwaysShowInHeader)){
+      this.showByComponent=false;
       this.headerService.toggleCurrentUserActivity(true);
       this.onDestroyListener.push(()=>this.headerService.toggleCurrentUserActivity(false));
       this.onValueChangeListener.push(num=>this.headerService.setCurrentUserActivity(num));
+    } else{
+      this.showByComponent=true;
     }
     this.onDestroyListener.push(
       this.activeUserService.observeUserActivity(this.room,user=>{