community/virt-manager: disable testCLI0263virt_xml

Test works by diffing libvirt-generated XML.  This makes the test dependent on
a specific libvirt version.  This is terrible.

community/virt-manager/APKBUILD

@@ -83,6 +83,8 @@ check() {
 		and not testCLI0415virt_clone
 		and not testCLI0416virt_clone
 		and not testCLI0424virt_clone
+
+		and not testCLI0263virt_xml
 	"
 	python3 -m pytest -k "$(echo $_skipped_tests | tr -d '\n')"
 }