Revert "show headers when composing"

This reverts commit 708787a101.

muttrc

@@ -46,14 +46,12 @@ macro index,pager \Cu |urlview\n
 # View attachments properly.
 bind attach <return> view-mailcap
 set fast_reply           # skip to compose when replying
-set edit_headers         # show headers when composing
 set fcc_attach           # save attachments with the body
 unset mime_forward       # forward attachments as part of body
 set forward_format = "Fwd: %s"       # format of subject when forwarding
 set forward_decode                   # decode when forwarding
 set forward_quote                    # include message in forwards
 
-
 #Ctrl-R to mark all as read
 macro index \Cr "T~U<enter><tag-prefix><clear-flag>N<untag-pattern>.<enter>" "mark all messages as read"