[O] Patch adding from-logo to ox-koma-letter.el

[Grant Rettke]

Hi,

This patch adds from-logo support to ox-koma-letter.el.

Tested it manually with Elisp and also in buffer properties. There are
four combinations (both in properties, both in Elisp, and then the two
permutations).

It was a copy-and-paste job so I marked it as a tinychange even though
it was more than 15 lines.

Ran the system tests and they pass.

Sincerely,

Grant Rettke

0001-ox-koma-letter.el-Adds-from-logo-variable.patch
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