Remove mw 1.39 routing mapping

Author: dati18

config/mw-db-version-map.php

@@ -2,7 +2,6 @@
 
 // TODO: Read from outside of this codebase so that MW updates do not require code changes here.
 $versionMap = [
-    'mw1.39-wbs1' => '139',
     'mw1.43-wbs1' => '143',
 ];