Trivial nit fixes (#12285)

packages/flutter_tools/lib/src/commands/create.dart

diff --git a/packages/flutter_tools/lib/src/commands/create.dart b/packages/flutter_tools/lib/src/commands/create.dart
index 6e31fa9..432b971 100644
--- a/packages/flutter_tools/lib/src/commands/create.dart
+++ b/packages/flutter_tools/lib/src/commands/create.dart
@@ -383,7 +383,7 @@
   final FileSystemEntityType type = fs.typeSync(dirPath);
 
   if (type != FileSystemEntityType.NOT_FOUND) {
-    switch(type) {
+    switch (type) {
       case FileSystemEntityType.FILE:
         // Do not overwrite files.
         return "Invalid project name: '$dirPath' - file exists.";