t/lib-rebase: set_fake_editor(): fix recognition of reset's short command

... in FAKE_LINES.

This has been broken ever since it was introduced in 5dcdd74
(t/lib-rebase: prepare for testing `git rebase --rebase-merges`,
2019-07-31), but it's not actually used, so it's a cosmetic defect
only.

Signed-off-by: Oswald Buddenhagen <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ossilator

t/lib-rebase.sh

@@ -49,7 +49,7 @@ set_fake_editor () {
 	action=\&
 	for line in $FAKE_LINES; do
 		case $line in
-		pick|p|squash|s|fixup|f|edit|e|reword|r|drop|d|label|l|reset|r|merge|m)
+		pick|p|squash|s|fixup|f|edit|e|reword|r|drop|d|label|l|reset|t|merge|m)
 			action="$line";;
 		exec_*|x_*|break|b)
 			echo "$line" | sed 's/_/ /g' >> "$1";;