chore(demo): fix select demo (#2959)

Author: kara

src/demo-app/select/select-demo.html

@@ -27,7 +27,7 @@
     <p> Touched: {{ drinkControl.touched }} </p>
     <p> Dirty: {{ drinkControl.dirty }} </p>
     <p> Status: {{ drinkControl.control?.status }} </p>
-    <button md-button (click)="currentDrink='sprite-1'">SET VALUE</button>
+    <button md-button (click)="currentDrink='water-2'">SET VALUE</button>
     <button md-button (click)="isRequired=!isRequired">TOGGLE REQUIRED</button>
     <button md-button (click)="isDisabled=!isDisabled">TOGGLE DISABLED</button>
     <button md-button (click)="drinkControl.reset()">RESET</button>