ZP-385 #comment deduplicate entries in the user agent history when converting device data #time 20m

git-svn-id: https://z-push.org/svn/z-push/trunk@1663 b7dd7b3b-3a3c-0410-9da9-bee62a6cc5b5

tools/migrate-2.0.x-2.1.0.php

@@ -190,7 +190,7 @@ class StateMigrator20xto210 {
                     $dev->deviceidOrg = $dev->deviceid;
 
                 $dev->deviceid = strtolower($dev->deviceid);
-                $dev->useragenthistory = array();
+                $dev->useragenthistory = array_unique($dev->useragenthistory);
                 $newdata[$user] = $dev;
             }
             $devState->devices = $newdata;