riched20: Repaint paragraph after undo format setting of the paragraph.

dlls/riched20/undo.c

@@ -341,6 +341,7 @@ static void ME_PlayUndoItem(ME_TextEditor *editor, struct undo_item *undo)
     add_undo_set_para_fmt( editor, &para->member.para );
     *para->member.para.pFmt = undo->u.set_para_fmt.fmt;
     para->member.para.border = undo->u.set_para_fmt.border;
+    para->member.para.nFlags |= MEPF_REWRAP;
     break;
   }
   case undo_set_char_fmt: