[API CHANGE] Drop obsolete TemplateRepositoryURL config key

Its use was removed in 2020 by
commit 9eaaf97ab3

Change-Id: I47b86a9b1bf528d611fa3a79054681bd85382bb0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/150989
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>

officecfg/registry/data/org/openoffice/Office/Common.xcu

@@ -39,9 +39,6 @@
       <prop oor:name="InfoURL" oor:type="xs:string">
         <value>${STARTCENTER_INFO_URL}</value>
       </prop>
-      <prop oor:name="TemplateRepositoryURL" oor:type="xs:string">
-        <value>${STARTCENTER_TEMPLREP_URL}</value>
-      </prop>
     </node>
     <prop oor:name="System">
       <value install:module="unx">UNIX</value>

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

@@ -3462,13 +3462,6 @@
           </info>
           <value/>
         </prop>
-        <prop oor:name="TemplateRepositoryURL" oor:type="xs:string" oor:nillable="false">
-          <info>
-            <desc>Contains a string specifying the URL to be browsed for
-            additional template documents</desc>
-          </info>
-          <value/>
-        </prop>
         <prop oor:name="StartCenterThumbnailsBackgroundColor" oor:type="xs:int" oor:nillable="false">
           <!-- Default 6710886 = 0x666666 as specified in tdf#90452, comment 45 -->
           <info>

postprocess/CustomTarget_registry.mk

@@ -579,7 +579,6 @@ postprocess_main_SED := \
 	-e 's,$${PRODUCTEXTENSION},.$(LIBO_VERSION_MICRO).$(LIBO_VERSION_PATCH)$(LIBO_VERSION_SUFFIX),g' \
 	-e 's,$${STARTCENTER_ADDFEATURE_URL},https://extensions.libreoffice.org/,g' \
 	-e 's,$${STARTCENTER_INFO_URL},https://www.libreoffice.org/,g' \
-	-e 's,$${STARTCENTER_TEMPLREP_URL},https://extensions.libreoffice.org/template-center/,g' \
 	-e 's,$${SYSTEM_LIBEXTTEXTCAT_DATA},$(SYSTEM_LIBEXTTEXTCAT_DATA),g' \
 	-e 's,$${SYSTEM_LIBNUMBERTEXT_DATA},$(SYSTEM_LIBNUMBERTEXT_DATA),g' \
 	-e 's,$${PRIVACY_POLICY_URL},$(PRIVACY_POLICY_URL),g' \