Removes inert attribute when editorService.closeAll() is called

[mattbrailsford]

Prerequisites

• I have added steps to test this contribution in the description below

If there's an existing issue for this PR then this fixes #10708

Description

Removes the inert attribute on #mainWrapper when editorService.closeAll() is called.

This code is necessary because when closeAll is called, there is no editor passed in args, and so removeEditor is never called, and so the focusLockService.removeInertAttribute(); method isn't called either.

This ensures focusLockService.removeInertAttribute(); is called if the editor arg is null, meaning it's come from a closeAll call.

To test, open a dialog via editorService.open and then call editorService.closeAll. The main editor window should have the inert attribute added and then removed once closed.

[umbrabot]

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