#22 Tell plugin removes wrong messages

[EdorFaus]

The Tell plugin doesn't save its messages properly when it removes one because it has been given to its recipient.
This causes it to repeat and lose messages after a reload.

Test case:
Start with no messages in config and freshly reloaded plugin.
Assuming your nick is "yourself", type these 3 lines:
!tell someone message1
!tell yourself message2
.

The bot will tell you message2.
After this, the config file should contain just message1, but instead contains just message2.