Need to change working directories so that the command works when called from...

Need to change working directories so that the command works when called from outside the flutter directory.

Removed accidental debug code.

bin/flutter.bat

@@ -12,6 +12,8 @@ SET script_path=%flutter_tools_dir%\bin\flutter_tools.dart
 REM TODO: Don't require dart to be on the user's path
 SET dart=dart
 
+REM Set current working directory to the flutter directory
+PUSHD %flutter_root%
 REM IF doesn't have an "or". Instead, just use GOTO
 FOR /f %%r IN ('git rev-parse HEAD') DO SET revision=%%r
 IF NOT EXIST %snapshot_path% GOTO do_snapshot
@@ -34,10 +36,11 @@ CALL pub.bat get
 CD "%flutter_root%"
 CALL %dart% --snapshot="%snapshot_path%" --package-root="%flutter_tools_dir%\packages" "%script_path%"
 <nul SET /p=%revision%> "%stamp_path%"
-goto :eof
 
 :after_snapshot
 
+REM Go back to last working directory
+POPD
 CALL %dart% "%snapshot_path%" %*
 
 IF /I "%ERRORLEVEL%" EQU "253" (