api!: remove APIs to create protected chats

Create unprotected group in test_create_protected_grp_multidev
The test is renamed accordingly.

SystemMessage::ChatE2ee is added in encrypted groups
regardless of whether they are protected or not.
Previously new encrypted unprotected groups
had no message saying that messages are end-to-end encrypted
at all.

deltachat-rpc-client/src/deltachat_rpc_client/account.py

@@ -300,7 +300,7 @@ class Account:
             chats.append(AttrDict(item))
         return chats
 
-    def create_group(self, name: str, protect: bool = False) -> Chat:
+    def create_group(self, name: str) -> Chat:
         """Create a new group chat.
 
         After creation,
@@ -317,12 +317,8 @@ class Account:
         To check, if a chat is still unpromoted, you can look at the `is_unpromoted` property of a chat
         (see `get_full_snapshot()` / `get_basic_snapshot()`).
         This may be useful if you want to show some help for just created groups.
-
-        :param protect: If set to 1 the function creates group with protection initially enabled.
-                        Only verified members are allowed in these groups
-                        and end-to-end-encryption is always enabled.
         """
-        return Chat(self, self._rpc.create_group_chat(self.id, name, protect))
+        return Chat(self, self._rpc.create_group_chat(self.id, name))
 
     def create_broadcast(self, name: str) -> Chat:
         """Create a new **broadcast channel**