Resolves: tdf#121940 mnemonic ends up in tooltip text

Change-Id: Ic698f23e71dbc613db2acf884fdefdeab06fde0f
Reviewed-on: https://gerrit.libreoffice.org/65968
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sw/source/uibase/wrtsh/wrtundo.cxx b/sw/source/uibase/wrtsh/wrtundo.cxx
index 2cc9e54..ee9c315 100644
--- a/sw/source/uibase/wrtsh/wrtundo.cxx
+++ b/sw/source/uibase/wrtsh/wrtundo.cxx
@@ -25,6 +25,7 @@
#include <swdtflvr.hxx>
#include <svtools/svtresid.hxx>
#include <svtools/strings.hrc>
#include <vcl/mnemonic.hxx>

// Undo ends all modes. If a selection is emerged by the Undo,
// this must be considered for further action.
@@ -108,7 +109,7 @@ OUString SwWrtShell::GetDoString( DoType eDoType ) const
    default:;//prevent warning
    }

    return SvtResId(pResStr) + aUndoStr;
    return MnemonicGenerator::EraseAllMnemonicChars(SvtResId(pResStr)) + aUndoStr;
}

void SwWrtShell::GetDoStrings( DoType eDoType, SfxStringListItem& rStrs ) const