Fix encrypted transfer

[cfoxon]

Encrypted transfer was sending account object to Memo() instead of the account string. This was triggering detection as a key ( len >= 51) and causing a KeyError

[brianoflondon]

I can confirm this little fix corrects my issue of sending transfers with encrypted memos.

Would like to see this released asap.

[brianoflondon]

For anyone else affected by this, in advance of it being folded into Beem properly the following magic works for me which just pulls Beem from @cfoxon 's github instead of the official one.

poetry add git+https://github.com/cfoxon/beem.git@d12631cc131fe9b4846617e21b9d7988360b3433

I'm using Poetry but I suspect this would also work:

pip install git+https://github.com/cfoxon/beem.git@d12631cc131fe9b4846617e21b9d7988360b3433

Poetry uninstalled beem for me, I'm not sure what Pip would do. Package management is not something I'm hugely proficient at.

[sicarius97]

Tested and works fine for me with these changes, can you check this out @holgern ?

[brianoflondon]

@holgern can this get released?