[FIX] mail: correct errors in b64 images handling

Rev 666b59484201004e2cd8890a9c09b6dcf023a725 introduced an autodetection
mechanism for transforming base64 embedded images inside emails into
attachment with a Content-ID URL.

The patch suffered from several issues:

- the base64 detection regex failed to detect base64 data that is folded
  over multiple lines - which happens to be the default in many Python
  versions when a binary field is read, or when using the base64 codec
  to encode a string.
  (Those cases where left untouched and the image was therefore missing)
- there was a logic error in the code when the same image was present
  multiple times, leading to an exception (`name` variable was
  referenced before being assigned)

This patch addresses both issues.

Fixes OPW-815073

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