Fix intermittent `ModalDialog` unit test failures #1365

Job	Run time
build-docker (macos-13)	17m 57s
build-desktop (macos, development)	2m 5s
build-docker (ubuntu-latest)	53s
build-web (macos, development)	47s
build-desktop (macos, production)	1m 41s
build-web (macos, production)	56s
build-desktop (ubuntu, development)	49s
build-web (macos, test)	1m 0s
build-desktop (ubuntu, production)	56s
build-web (ubuntu, development)	36s
build-desktop (windows, development)	3m 59s
build-web (ubuntu, production)	38s
build-desktop (windows, production)	3m 56s
build-web (ubuntu, test)	41s
build-web (windows, development)	3m 56s
build-web (windows, production)	2m 1s
build-web (windows, test)	5m 11s
	48m 2s

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