Revert "There's no offline_upgrade.bat anymore"

This reverts commit 14cfb0b5e2.

packages/fwsupdates.xml

@@ -17,6 +17,7 @@
         <install cmd='%COMSPEC% /C xcopy /I /E /Y "%SOFTWARE%\fwsupdates\FWSUpdates\assets" "%SystemDrive%\FWSUpdates\assets.upgrade"' />
         <install cmd='%COMSPEC% /C xcopy /I /E /Y "%SOFTWARE%\fwsupdates\FWSUpdates\bin" "%SystemDrive%\FWSUpdates\bin.upgrade"' />
         <install cmd='%COMSPEC% /C xcopy /I /E /Y "%SOFTWARE%\fwsupdates\FWSUpdates\lang" "%SystemDrive%\FWSUpdates\lang.upgrade"' />
+        <install cmd='%COMSPEC% /C copy /Y "%SOFTWARE%\fwsupdates\offline_upgrade.bat" "%SystemDrive%\FWSUpdates"' />
         <install cmd='%COMSPEC% /C if not exist "%SystemDrive%\FWSUpdates\repository" mkdir "%SystemDrive%\FWSUpdates\repository"' />
         <install cmd='%COMSPEC% /C if not exist "%SystemDrive%\FWSUpdates\status" mkdir "%SystemDrive%\FWSUpdates\status"' />
         <install cmd='%COMSPEC% /C if not exist "%SystemDrive%\FWSUpdates\conf\adm" mkdir "%SystemDrive%\FWSUpdates\conf\adm"' />