fix libspatialite loading

ffdnispdb/__init__.py

@@ -37,7 +37,7 @@ def create_app(config={}):
         @event.listens_for(db.engine, "connect")
         def connect(sqlite, connection_rec):
             sqlite.enable_load_extension(True)
-            sqlite.execute('select load_extension("libspatialite.so")')
+            sqlite.execute('select load_extension("mod_spatialite.so")')
             sqlite.enable_load_extension(False)
 
     app.session_interface = sess