Improve notifications delete button

lib/ui/screens/notifications_screen.dart

@@ -26,6 +26,14 @@ enum _Status { LOADING, ERROR, NONE }
 enum _PopupMenuActions { DELETE }
 
 class NotificationsScreen extends StatefulWidget {
+  final bool useSmallDeleteButton;
+
+  const NotificationsScreen({
+    Key key,
+    this.useSmallDeleteButton = false,
+  })  : assert(useSmallDeleteButton != null),
+        super(key: key);
+
   @override
   _NotificationsScreenState createState() => _NotificationsScreenState();
 }
@@ -100,13 +108,14 @@ class _NotificationsScreenState extends SafeState<NotificationsScreen> {
         ),
         // Add conversation button
         Positioned(
-          right: 20.0,
-          bottom: 20.0,
+          right: widget.useSmallDeleteButton ? 0.0 : 20.0,
+          bottom: widget.useSmallDeleteButton ? 0.0 : 20.0,
           child: FloatingActionButton(
+            mini: widget.useSmallDeleteButton,
             onPressed: () => _deleteAllNotifications(),
             child: Icon(Icons.delete),
           ),
-        ),
+        )
       ]),
     );
   }

lib/ui/widgets/tablet_mode/tablet_appbar_widget.dart

@@ -64,7 +64,7 @@ class _ComunicTabletAppBarWidgetState
           notificationsBadge: _unreadNotifications.notifications,
           onBuildOverlay: (c) => Padding(
             padding: const EdgeInsets.all(8.0),
-            child: NotificationsScreen(),
+            child: NotificationsScreen(useSmallDeleteButton: true),
           ),
         ),
         AppBarCustomDropDownWidget(