Update --enable-online-update-mar server URL

...after consultation with hostmaster@documentfoundation.org about an
appropriate URL

Change-Id: Ie8214081b68fb14f1a7824ea7cc2301abe8c1642
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/161070
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>
(cherry picked from commit 0d036d22a54234c2b9283ad2e9f37cca7513d50f)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/161026
diff --git a/officecfg/registry/schema/org/openoffice/Office/Update.xcs b/officecfg/registry/schema/org/openoffice/Office/Update.xcs
index 1eed1a8..6657389 100644
--- a/officecfg/registry/schema/org/openoffice/Office/Update.xcs
+++ b/officecfg/registry/schema/org/openoffice/Office/Update.xcs
@@ -41,7 +41,7 @@
            <info>
                <desc>The URL that is used for the update check</desc>
            </info>
            <value>http://vm195.documentfoundation.org/</value>
            <value>https://update-mar.libreoffice.org/</value>
        </prop>
        <prop oor:name="UpdateChannel" oor:type="xs:string" oor:nillable="false">
            <info>