fix(webapp): change toolbar activation height (#1390)

When the in fullscreen mode, the session toolbar was not appearing
when the cursor was moved to the top of the screen.

Author: RRRadicalEdward

webapp/src/client/app/shared/components/session-toolbar/session-toolbar.component.ts

@@ -1,4 +1,5 @@
 import { Component, ElementRef, HostListener, Input, Renderer2 } from '@angular/core';
+import { WebSession } from '@shared/models/web-session.model';
 import { UtilsService } from '@shared/services/utils.service';
 
 @Component({
@@ -79,9 +80,11 @@ export class SessionToolbarComponent {
       return;
     }
 
-    if (event.clientY === 0) {
+    const TOOLBAR_ACTIVATION_HEIGHT = 10;
+
+    if (event.clientY <= TOOLBAR_ACTIVATION_HEIGHT) {
       this.showToolbarDiv = true;
-    } else if (event.clientY > 44) {
+    } else if (event.clientY > WebSession.TOOLBAR_SIZE) {
       this.showToolbarDiv = false;
     }
   }