Drop the search placeholder from the bootstrapper

This isn't a property of the card container anymore. If desired, we can eventually add an example of binding it directly to the card search component.

Author: KorinaGraber

bootstrapper/cards/cardsNg2.html

@@ -50,7 +50,7 @@ <h3>Cards</h3>
 </div>
 <div>
 	<label>Card container with search:</label>
-	<rlCardContainer [builder]="searchBuilder" [searchPlaceholder]="'Custom Placeholder'">
+	<rlCardContainer [builder]="searchBuilder">
 		<div *rlColumnHeader="let value; name 'value'">Number</div>
 		<div *rlColumnContent="let value; name 'value'">#{{value}}</div>
 		<div *rlCardContent="let myItem">