rebase -i: respect core.abbrev

collapse_todo_ids() uses `git rev-parse --short=7' to abbreviate
commit ids before showing them to the user in a text editor.  Let's
drop argument from --short to the configured value instead (still
defaulting to 7).

Signed-off-by: Kirill A. Shutemov <[email protected]>
Acked-by: Eric Sunshine <[email protected]>
Signed-off-by: Jonathan Nieder <[email protected]>

Author: kiryl

git-rebase--interactive.sh

@@ -713,7 +713,7 @@ expand_todo_ids() {
 }
 
 collapse_todo_ids() {
-	transform_todo_ids --short=7
+	transform_todo_ids --short
 }
 
 # Rearrange the todo list that has both "pick sha1 msg" and