Breaking: Discount is applicable on sale category and not on menu category

Fix the import, etc on this.
While entering discount in sale, it checks the max allowed.

bookie/src/app/sales/discount/discount.component.html

@@ -14,6 +14,7 @@
         <mat-cell *matCellDef="let row; let i = index" class="center" [formGroupName]="i" fxFlex>
           <mat-form-field>
             <input matInput type="number" formControlName="discount" autocomplete="off" />
+            <mat-hint>Maximum Discount {{ row.discountLimit | percent: '1.2-2' }}</mat-hint>
           </mat-form-field>
         </mat-cell>
       </ng-container>