cypress: php-proxy: blacklist formulabar related test.

Change-Id: Ia5224adc358d6099056ee0b9938ab8b50e7f4e80
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/102893
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>

cypress_test/plugins/blacklists.js

@@ -98,6 +98,9 @@ var phpProxyBlackList = [
 	['mobile/writer/table_properties_spec.js',
 		[]
 	],
+	['desktop/calc/focus_spec.js',
+		[]
+	],
 ];
 
 module.exports.coreBlackLists = coreBlackLists;