fdo#67653: Revert "go back to 8 colorvalueset columns"

This reverts commit 7e7ccea7.

Change-Id: Idc09233ccd53a7368da978bb7c1a04a640118e62
Reviewed-on: https://gerrit.libreoffice.org/5503Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

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

@@ -6262,7 +6262,7 @@
           </desc>
           <label>Defines the number of columns that will be shown in a ColorValueSet.</label>
         </info>
-        <value>8</value>
+        <value>12</value>
       </prop>
       <prop oor:name="PreviewUsesCheckeredBackground" oor:type="xs:boolean">
         <info>