demo(chips): Set addOnBlur for both inputs (#7812)

It's confusing to only have addOnBlur work for one example.

src/demo-app/chips/chips-demo.html

@@ -58,7 +58,7 @@
           <input placeholder="New Contributor..."
                  [matChipInputFor]="chipList1"
                  [matChipInputSeparatorKeyCodes]="separatorKeysCodes"
-                 [matChipInputAddOnBlur]="false"
+                 [matChipInputAddOnBlur]="addOnBlur"
                  (matChipInputTokenEnd)="add($event)" />
         </mat-chip-list>
       </mat-form-field>