theming: Separate `primary` and `background` colors - fix the header menu colors #4817

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	5m 36s
integration-sqlite (collaboration_features, 8.2, main)	8m 21s
integration-sqlite (comments_features, 8.2, main)	8m 30s
integration-sqlite (dav_features, 8.2, main)	12m 29s
integration-sqlite (features, 8.2, main)	14m 1s
integration-sqlite (federation_features, 8.2, main)	9m 46s
integration-sqlite (--tags ~@large files_features, 8.2, main)	16m 44s
integration-sqlite (filesdrop_features, 8.2, main)	5m 37s
integration-sqlite (openldap_features, 8.2, main)	6m 1s
integration-sqlite (openldap_numerical_features, 8.2, main)	5m 20s
integration-sqlite (ldap_features, 8.2, main)	6m 22s
integration-sqlite (remoteapi_features, 8.2, main)	5m 29s
integration-sqlite (setup_features, 8.2, main)	5m 33s
integration-sqlite (sharees_features, 8.2, main)	9m 40s
integration-sqlite (sharing_features, 8.2, main)	20m 1s
integration-sqlite (videoverification_features, 8.2, main)	9m 53s
integration-sqlite-summary	9s
	2h 29m 38s

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