[telemetry] Ensure page sets reference the right WPR archives.

tools/perf/page_sets/data/typical_25.json

 {
-    "page_set": "../typical_25.json", 
     "description": "Describes the Web Page Replay archives for a page set. Don't edit by hand! Use record_wpr for updating.", 
     "archives": {
         "typical_25_000.wpr": [
             "http://www.nick.com/games", 
             "http://www.rei.com/", 
             "http://www.fifa.com/", 
             "http://www.gamestop.com/ps3", 
             "http://www.barnesandnoble.com/u/books-bestselling-books/379003057/", 
             "http://www.economist.com/news/science-and-technology/21573529-small-models-cosmic-phenomena-are-shedding-light-real-thing-how-build", 
             "http://www.theonion.com", 
@@ skipping 11 matching lines @@
             "http://walgreens.com", 
             "http://colorado.edu", 
             "http://www.ticketmaster.com/JAY-Z-and-Justin-Timberlake-tickets/artist/1837448?brand=none&tm_link=tm_homeA_rc_name2", 
             "http://www.theverge.com/2013/3/5/4061684/inside-ted-the-smartest-bubble-in-the-world", 
             "http://www.airbnb.com/", 
             "http://www.ign.com/", 
             "http://www.fda.gov"
         ]
     }
 }