Refactor "substr" calls in lib/public to improve code readability #8677

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	4m 46s
integration-sqlite (collaboration_features, 8.2, main)	6m 42s
integration-sqlite (comments_features, 8.2, main)	4m 28s
integration-sqlite (dav_features, 8.2, main)	8m 7s
integration-sqlite (features, 8.2, main)	9m 29s
integration-sqlite (federation_features, 8.2, main)	7m 3s
integration-sqlite (--tags ~@large files_features, 8.2, main)	9m 46s
integration-sqlite (filesdrop_features, 8.2, main)	3m 59s
integration-sqlite (openldap_features, 8.2, main)	4m 40s
integration-sqlite (openldap_numerical_features, 8.2, main)	4m 19s
integration-sqlite (ldap_features, 8.2, main)	4m 26s
integration-sqlite (remoteapi_features, 8.2, main)	4m 34s
integration-sqlite (setup_features, 8.2, main)	4m 25s
integration-sqlite (sharees_features, 8.2, main)	5m 44s
integration-sqlite (sharing_features, 8.2, main)	13m 28s
integration-sqlite (videoverification_features, 8.2, main)	6m 41s
integration-sqlite-summary	5s
	1h 42m 48s

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