[flutter_tools] fix exit label for batchfile (#62272)

move the final_exit label to the correct script location for the flutter/dart entrypoints.

bin/dart.bat

@@ -32,6 +32,3 @@ REM Do not use the CALL command in the next line to execute Dart. CALL causes
 REM Windows to re-read the line from disk after the CALL command has finished
 REM regardless of the ampersand chain.
 "%dart%" %* & exit /B !ERRORLEVEL!
-
-:final_exit
-EXIT /B %exit_code%

bin/flutter.bat

@@ -52,6 +52,3 @@ REM Do not use the CALL command in the next line to execute Dart. CALL causes
 REM Windows to re-read the line from disk after the CALL command has finished
 REM regardless of the ampersand chain.
 "%dart%" --disable-dart-dev --packages="%flutter_tools_dir%\.packages" %FLUTTER_TOOL_ARGS% "%snapshot_path%" %* & exit /B !ERRORLEVEL!
-
-:final_exit
-EXIT /B %exit_code%

bin/internal/shared.bat

@@ -158,3 +158,6 @@ GOTO :after_subroutine
   EXIT /B
 
 :after_subroutine
+
+:final_exit
+  EXIT /B %exit_code%