reverted some changes

reverted changes to purgeAircraft, purgeFlights, purgePositions as these are used as simple TRUE/FALSE tests.
split the changes to purge_days_old to to using the more popular seeming fetchone()[0] and a seperate cast to int

build/portal/python/maintenance.py

@@ -64,21 +64,21 @@ while True:
     cursor.execute("SELECT value FROM adsb_settings WHERE name = 'purgeFlights'")
     row = cursor.fetchone()
     if row:
-        purge_flights = int(row[0])
+        purge_flights = row
 
     purge_positions = False
     # MySQL and SQLite
     cursor.execute("SELECT value FROM adsb_settings WHERE name = 'purgePositions'")
     row = cursor.fetchone()
     if row:
-        purge_positions = int(row[0])
+        purge_positions = row
 
     purge_days_old = False
     # MySQL and SQLite
     cursor.execute("SELECT value FROM adsb_settings WHERE name = 'purgeDaysOld'")
-    row = cursor.fetchone()
+    row = cursor.fetchone()[0]
     if row:
-        purge_days_old = int(row[0])
+        purge_days_old = int(row)
 
     ## Create the purge date from the age specified.