samples(list): fixing some input types

Author: ChronosSF

src/app/lists/list/list-item-selection/list-item-selection.component.html

@@ -10,11 +10,11 @@
 
 <div class="list-sample">
     <igx-list>
-        <igx-list-item isHeader="true">Contacts</igx-list-item>
+        <igx-list-item [isHeader]="true">Contacts</igx-list-item>
         <igx-list-item [ngClass]="contact.selected ? 'selected' : ''"
                        (click)="selectItem(contact)"
                        *ngFor="let contact of contacts | igxFilter: filterContacts;">
-            <igx-avatar igxListThumbnail [src]="contact.photo" roundShape="true"></igx-avatar>
+            <igx-avatar igxListThumbnail [src]="contact.photo" [roundShape]="true"></igx-avatar>
             <span igxListLineTitle>{{ contact.name }}</span>
             <span igxListLineSubTitle>{{ contact.phone }}</span>
             <igx-icon igxListAction [style.color]="contact.isFavorite ? 'orange' : 'lightgray'" (click)="toggleFavorite(contact, $event)">star</igx-icon>