default geometry of message window

[Kang Jeong-Hee <Keizi mail co kr>]

this composing window save its geometry on closing.
so next opening of composing window get the right geometry that I prefer.

but reading window does not save that.
so every time I open a message to read,
I have to resize window to fit width of text.

pliz make it saved for reading window. :)

thx