Fix argument out of range exception in manage game instances dialog #716

Job	Run time
check-dev-build	3s
smoke-inflator / build-release / build	1m 26s
test-release / build-debug / build	1m 34s
smoke-inflator / smoke-test-inflator	54s
test-release / test-build	1m 10s
smoke-inflator / notify	0s
test-release / notify	0s
upload-release-s3	10s
upload-deb	50s
upload-rpm	41s
upload-metadata-tester	1m 23s
upload-inflator	3m 31s
notify-discord / Notify Discord	4s
	11m 46s

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