Removed db argument from Group class

This argument was redundant, since it is also a member of the Admidio class, which is also an argument of Group.

admidio.py

@@ -62,7 +62,7 @@ class Admidio:
         self.cursor.execute(sql)
 
         for row in self.cursor.fetchall():
-            self.groups[row[0]] = group.Group(self.db, row[0], row[1], self)
+            self.groups[row[0]] = group.Group(row[0], row[1], self)
 
     def initEvents(self):
         """Initialises all comming events and passed events <3 months"""

group.py

@@ -2,8 +2,8 @@ from admidio_python_api.exceptions import MemberNotFoundException
 
 
 class Group:
-    def __init__(self, db, group_id, name, admidio):
+    def __init__(self, group_id, name, admidio):
-        self.__c = db.cursor()
+        self.__c = admidio.db.cursor()
         self.id = group_id
         self.name = name
         self.admidio = admidio