fix(theming): Conitionally disable blur filter for performance #6669

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	55s
integration-sqlite (collaboration_features, 8.2, main)	1m 59s
integration-sqlite (comments_features, 8.2, main)	7m 59s
integration-sqlite (dav_features, 8.2, main)	11m 53s
integration-sqlite (features, 8.2, main)	6m 14s
integration-sqlite (federation_features, 8.2, main)	2m 23s
integration-sqlite (--tags ~@large files_features, 8.2, main)	6m 30s
integration-sqlite (filesdrop_features, 8.2, main)	59s
integration-sqlite (openldap_features, 8.2, main)	1m 2s
integration-sqlite (openldap_numerical_features, 8.2, main)	5m 51s
integration-sqlite (ldap_features, 8.2, main)	6m 3s
integration-sqlite (remoteapi_features, 8.2, main)	56s
integration-sqlite (setup_features, 8.2, main)	47s
integration-sqlite (sharees_features, 8.2, main)	9m 20s
integration-sqlite (sharing_features, 8.2, main)	18m 44s
integration-sqlite (videoverification_features, 8.2, main)	10m 5s
integration-sqlite-summary	4s
	1h 31m 50s

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