fix: use the provided cmd

previously would just change to the correct thing, and then change back
to the wrong one, because fn called twice for diff things,
that's why the git-rebase-todo file looked the same

Signed-off-by: Kipras Melnikovas <kipras@kipras.org>

Author: kiprasmel

git-stacked-rebase.ts

@@ -613,9 +613,9 @@ export const gitStackedRebase = async (
 					`invalid old name of command in git-rebase-todo file. got "${words[0]}", expected one of "${allowedOldName}".`
 				);
 				words[0] = newName;
-				console.log({ before: linesOfEditedRebaseTodo[oldLatestBranchCmd.lineNumber] });
-				linesOfEditedRebaseTodo[oldLatestBranchCmd.lineNumber] = words.join(" ");
-				console.log({ after: linesOfEditedRebaseTodo[oldLatestBranchCmd.lineNumber] });
+				console.log({ before: linesOfEditedRebaseTodo[cmd.lineNumber] });
+				linesOfEditedRebaseTodo[cmd.lineNumber] = words.join(" ");
+				console.log({ after: linesOfEditedRebaseTodo[cmd.lineNumber] });
 			}
 
 			fs.writeFileSync(pathToStackedRebaseTodoFile, linesOfEditedRebaseTodo.join("\n"), { encoding: "utf-8" });