Revert "gitconfig: git config --global format.signOff true"

Summary:
This reverts commit 761a5d6c1f.

Was not the thing I was expecting.

Signed-off-by: Yongmin Hong <revi@omglol.email>

Test Plan: N/A

Reviewers: O1 revi & automations, revi

Reviewed By: O1 revi & automations, revi

Differential Revision: https://issuetracker.revi.xyz/D118

.gitaliases

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 [alias]
   co = checkout
-  cm = commit
+  cm = commit -s
   st = status
   br = branch -v
   fa = fetch --all
@@ -21,10 +21,11 @@
   por = push origin master
   pon = push origin main
   amend = commit --amend
-  cmt = commit -S
-  amends = commit --amend -S
-  acmt = commit -a -S
-  acm = commit -a
+  amends = commit --amend -s
+  cmt = commit -S -s
+  amendss = commit --amend -S -s
+  acmt = commit -a -S -s
+  acm = commit -a -s
   fup = fetch upstream
   com = !echo 'ERROR: use cor for master, and con for main.'
   comr = checkout master

default.gitconfig

@@ -22,8 +22,6 @@
   smudge = git-lfs smudge -- %f
   process = git-lfs filter-process
   required = true
-[format]
-  signOff = true
 [sendemail]
   from = 'Yongmin Hong <revi@omglol.email>'
   smtpserver = smtp.fastmail.com