related tdf#68274: switch on MAR-based auto-updater by default

On platforms built with --enable-online-update-mar, make the automatic
online update the default now.

Change-Id: I4d8355023f185b89aa25701bcc02a15986d3d969
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172335
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>

configure.ac

@@ -1947,8 +1947,9 @@ libo_FUZZ_ARG_ENABLE(online-update,
 
 libo_FUZZ_ARG_ENABLE(online-update-mar,
     AS_HELP_STRING([--enable-online-update-mar],
-        [Enable the experimental Mozilla-like online update service that will
+        [Enable the Mozilla-like online update service that will
-         check for new versions of LibreOffice. Disabled by default.]),
+         check for new versions of LibreOffice. Currently only works for
+         Windows and Linux. Disabled by default.]),
 ,)
 
 libo_FUZZ_ARG_WITH(online-update-mar-baseurl,

officecfg/registry/schema/org/openoffice/Office/Update.xcs

@@ -20,10 +20,10 @@
         <prop oor:name="Enabled" oor:type="xs:boolean" oor:nillable="false">
             <info>
                 <desc>Determines if the automatic Updater is enabled
-                or disabled. Defaults to false, as long as this is
+                or disabled. Defaults to true, only active in binary
-                regarded experimental.</desc>
+                if compiled with MAR updater support.</desc>
             </info>
-            <value>false</value>
+            <value>true</value>
         </prop>
         <prop oor:name="Mode" oor:type="xs:int" oor:nillable="false">
             <info>