fix(virtual-background): Set x scale to default value on desktop share as a virtual background deactivation.

react/features/virtual-background/components/VirtualBackgroundDialog.js

             dispatch(updateSettings({
                 localFlipX: !_localFlipX
             }));
+        } else {
+
+            // Set x scale to default value.
+            dispatch(updateSettings({
+                localFlipX: true
+            }));
         }
         dispatch(hideDialog());
     }, [ dispatch, options, _localFlipX ]);

react/features/virtual-background/functions.js

 // @flow
 
 import { JitsiTrackEvents } from '../base/lib-jitsi-meet';
+import { updateSettings } from '../base/settings';
 
 import { toggleBackgroundEffect } from './actions';
 let filterSupport;
     desktopTrack
     && desktopTrack.on(JitsiTrackEvents.LOCAL_TRACK_STOPPED, () => {
         dispatch(toggleBackgroundEffect(noneOptions, currentLocalTrack));
+
+        // Set x scale to default value.
+        dispatch(updateSettings({
+            localFlipX: true
+        }));
     });
 }