Revert "git-arc: Add stage -n to not change the branch"

It shouldn't have been pushed

This reverts commit 1c6170d771.

tools/tools/git/git-arc.sh

@@ -654,15 +654,11 @@ gitarc__stage()
     local author branch commit commits diff reviewers title tmp
 
     branch=main
-    change_branch=yes
-    while getopts b:n o; do
+    while getopts b: o; do
         case "$o" in
         b)
             branch="$OPTARG"
             ;;
-        n)
-            change_branch=no
-            ;;
         *)
             err_usage
             ;;
@@ -672,12 +668,10 @@ gitarc__stage()
 
     commits=$(build_commit_list "$@")
 
-    if [ "$change_branch" = "yes" ]; then
-        if [ "$branch" = "main" ]; then
-            git checkout -q main
-        else
-            git checkout -q -b "${branch}" main
-        fi
+    if [ "$branch" = "main" ]; then
+        git checkout -q main
+    else
+        git checkout -q -b "${branch}" main
     fi
 
     tmp=$(xmktemp)