Remove import fix for ME 0.7 support

Author: lafrech

flask_mongoengine/__init__.py

@@ -7,10 +7,7 @@
 import mongoengine
 from distutils.version import StrictVersion
 
-if mongoengine.__version__ == '0.7.10':
-    from mongoengine.base import BaseField
-else:
-    from mongoengine.base.fields import BaseField
+from mongoengine.base.fields import BaseField
 
 
 from mongoengine.queryset import MultipleObjectsReturned, DoesNotExist, QuerySet