fdo#86494: sw: fix crash on exit from SwAutoCorrect

5bff4b016c4b44f4123e0e6a4fd4c0c4dc0cfa2d was not enough to fix it,
so move it to SwDLL so it gets deleted earlier, before the global
pool items.

(regression from 4404b718bdb547cb9b7b17c73a53574724cdeeb7)

Change-Id: I4f88047852ea71f07ffa1f272ea66743f9797327