fix some bad indentations (#41172)

diff --git a/packages/flutter_tools/lib/src/version.dart b/packages/flutter_tools/lib/src/version.dart
index 7a73194..210f96e 100644
--- a/packages/flutter_tools/lib/src/version.dart
+++ b/packages/flutter_tools/lib/src/version.dart
@@ -66,7 +66,7 @@
         final String remote = channel.substring(0, slash);
         _repositoryUrl = _runGit('git ls-remote --get-url $remote');
         _channel = channel.substring(slash + 1);
-       } else if (channel.isEmpty) {
+      } else if (channel.isEmpty) {
         _channel = 'unknown';
       } else {
         _channel = channel;