some formatting of map, parameters and spaces (#29760)

diff --git a/packages/flutter_tools/lib/src/build_info.dart b/packages/flutter_tools/lib/src/build_info.dart
index 2e3322b..60babd6 100644
--- a/packages/flutter_tools/lib/src/build_info.dart
+++ b/packages/flutter_tools/lib/src/build_info.dart
@@ -10,7 +10,9 @@
 
 /// Information about a build to be performed or used.
 class BuildInfo {
-  const BuildInfo(this.mode, this.flavor, {
+  const BuildInfo(
+    this.mode,
+    this.flavor, {
     this.trackWidgetCreation = false,
     this.compilationTraceFilePath,
     this.createBaseline = false,