Put current git branch name as value when renaming (#72957)

* Put current git branch name as value when renaming

* Simplify code

extensions/git/src/commands.ts

@@ -1572,8 +1572,11 @@ export class CommandCenter {
 
 	@command('git.renameBranch', { repository: true })
 	async renameBranch(repository: Repository): Promise<void> {
-		const placeHolder = localize('provide branch name', "Please provide a branch name");
-		const name = await window.showInputBox({ placeHolder });
+		const name = await window.showInputBox({
+			placeHolder: localize('branch name', "Branch name"),
+			prompt: localize('provide branch name', "Please provide a branch name"),
+			value: repository.HEAD && repository.HEAD.name
+		});
 
 		if (!name || name.trim().length === 0) {
 			return;