Fix type error when picking a random cache

Author: matyasselmeci

bin/stashcp

@@ -453,7 +453,7 @@ def get_best_stashcache():
 
     if order_str == '':
         # Unable to find a geo_ip server to use, return random choice from caches!
-        minsite = random.choice(caches_list)
+        minsite = random.choice(caches_list)['name']
         logging.error("Unable to use Geoip to find closest cache!  Returning random cache %s", minsite)
         return minsite
     else: