Set back this 20 MB default value for compatibility reasons

See also:
dbdacc73

This ten multiplier which was moved from the implementation
to the settings is live in the code only from 4.4 version, so
actually we can remove it without any problem, don't need to change
the default value on the UI.
I don't have any other reason to change that value so...

Change-Id: Ia17874cafeb013b89eedc300710392763c868f44

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

@@ -1466,7 +1466,7 @@
             objects.</desc>
             <label>Total Graphic Cache Size</label>
           </info>
-          <value>209715200</value>
+          <value>22000000</value>
         </prop>
         <prop oor:name="ObjectCacheSize" oor:type="xs:int" oor:nillable="false">
           <info>