fix(dav): overwrite report method for subscription calendars #786

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	4m 7s
integration-sqlite (collaboration_features, 8.2, main)	6m 37s
integration-sqlite (comments_features, 8.2, main)	7m 0s
integration-sqlite (dav_features, 8.2, main)	9m 0s
integration-sqlite (features, 8.2, main)	11m 19s
integration-sqlite (federation_features, 8.2, main)	8m 44s
integration-sqlite (--tags ~@large files_features, 8.2, main)	16m 49s
integration-sqlite (filesdrop_features, 8.2, main)	4m 6s
integration-sqlite (openldap_features, 8.2, main)	4m 48s
integration-sqlite (openldap_numerical_features, 8.2, main)	3m 44s
integration-sqlite (ldap_features, 8.2, main)	4m 28s
integration-sqlite (remoteapi_features, 8.2, main)	4m 20s
integration-sqlite (setup_features, 8.2, main)	3m 52s
integration-sqlite (sharees_features, 8.2, main)	8m 11s
integration-sqlite (sharing_features, 8.2, main)	15m 52s
integration-sqlite (videoverification_features, 8.2, main)	7m 59s
integration-sqlite-summary	5s
	2h 1m 8s

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