mapProjectAssets.test: mock fitWorld for Map child LWC

The Map LWC is a child of MapProjectAssets LWC.
Since we updated the Map LWC to call fitWorld() by
default, we need to add a mock function in the
mock Leaflet map object here.

salesforce/my-conservation-life/force-app/main/default/lwc/mapProjectAssets/__tests__/mapProjectAssets.test.js

@@ -53,7 +53,8 @@ describe('c-map-project-assets', () => {
             latLng: jest.fn(),
             map: jest.fn(() => ({
                 type: 'map',
-                fitBounds: fitBounds
+                fitBounds: fitBounds,
+                fitWorld: jest.fn()
             })),
             marker: jest.fn(),
             tileLayer: jest.fn(() => ({