Cards not updated after changing .md file and Send To Own Deck

[rleyvasal]

Issue

If I create a deck as shown below and Send to Own Deck

# Multiply

## 2 X 2 = 3

and then update the contents and Send To Own Deck

# Multiply

## 2 X 2 = 4

The card in the deck does not get corrected, but instead, a new card is created.

Expected

After the Markdown is corrected, the Deck and Cards get updated.

Note: It becomes tedious to delete a deck from Anki every time a mistake is found, it would be more helpful to be able to update existing card with updated .md file.

[benjamin-weller]

Please see my PR