[FIX] mrp: Allow leaving the BOM Overview

Typo made the call to `this.changeFolded` instead of
`this.props.changeFolded`. As it couldn't be found in the unmount, it
raised an error each time the user tried to leave the report.

Steps to reproduce :
Go to MRP -> Products -> Bill of Materials -> Any BoM -> Overview -> Go
anywhere else than the report.

Also got rid of the now useless `this.bus` in the main overview
component.

opw-3061658

closes odoo/odoo#105773

X-original-commit: c22e7a2a245ce98654a4d99a663c555bedfee165
Signed-off-by: Tiffany Chang <tic@odoo.com>

addons/mrp/static/src/components/bom_overview/mrp_bom_overview.js

@@ -11,7 +11,6 @@ export class BomOverviewComponent extends Component {
     setup() {
         this.orm = useService("orm");
         this.actionService = useService("action");
-        this.bus = new EventBus();
 
         this.variants = [];
         this.warehouses = [];

addons/mrp/static/src/components/bom_overview_extra_block/mrp_bom_overview_extra_block.js

@@ -25,7 +25,7 @@ export class BomOverviewExtraBlock extends Component {
 
         onWillUnmount(() => {
             // Need to notify main component that the block was folded so it doesn't appear on the PDF.
-            this.changeFolded({ ids: [this.identifier], isFolded: true });
+            this.props.changeFolded({ ids: [this.identifier], isFolded: true });
         });
     }