check_activity now looks for placeholder div. Fixes #24

Previously we checked if the peer's status contained the word "Synced"
to tell if we were syncing or not.  This didn't work if the web
interface was set to a language other than English.  However, looking
for the Up/Down arrow placeholder div will always work.

Author: marxjohnson

btsyncindicator.py

@@ -369,7 +369,7 @@ def check_activity(self, folders):
         isactive = False
         for folder in folders:
             for peer in folder['peers']:
-                if peer['status'].find('Synced') == -1:
+                if peer['status'].find('<div') != -1:
                     logging.info('Sync activity detected')
                     isactive = True
                     break