Some real extension for MarinerWrite

Change-Id: I7b09694775bd07feb819bb3279171434216b1961

filter/source/config/fragments/types/writer_Mariner_Write.xcu

@@ -18,7 +18,7 @@
     <node oor:name="writer_Mariner_Write" oor:op="replace" >
         <prop oor:name="DetectService"><value>com.sun.star.comp.Writer.MWAWImportFilter</value></prop>
         <prop oor:name="URLPattern"/>
-        <prop oor:name="Extensions"><value>dummy</value></prop>
+        <prop oor:name="Extensions"><value>mwd</value></prop>
         <prop oor:name="MediaType"><value></value></prop>
         <prop oor:name="Preferred"><value>true</value></prop>
         <prop oor:name="PreferredFilter"><value>Mariner_Write</value></prop>