hgeditor: Remove EMAIL default for HGUSER, comment editor selection

# HG changeset patch
# User Radoslaw "AstralStorm" Szkodzinski <[e-mail]>
# Node ID a4c688c8273e392b1bf33cfc736e00ec752a415e
# Parent  be12687d4bf0ce16c4207bef85c188de66efbf53
hgeditor: Remove EMAIL default for HGUSER, comment editor selection 

HGUSER is already set to EMAIL by Python code if needed

hgeditor

@@ -9,6 +9,8 b' cleanup_exit() {'
     exit $1
 }
 
+# If you want to pass your favourite editor some other parameters
+# only for Mercurial, modify this:
 case "${EDITOR:=vi}" in
     emacs)
         EDITOR="$EDITOR -nw"
@@ -44,7 +46,7 b' else'
     {
         head -n 1 "$T1"
         echo
-        grep -v "^HG:" "$T1" | gpg -t -a -u "${HGUSER:-$EMAIL}" --clearsign
+        grep -v "^HG:" "$T1" | gpg -t -a -u "${HGUSER}" --clearsign
     } > "$T2" && mv "$T2" "$1"
     cleanup_exit $?
 fi