FileDialogHelper_Impl::addFilters. Don't leak matcher.

commit 178fc3 removed the creation of filter matcher and explicitly
set mbDeleteMatcher to sal_False. commit 551f85 reintroduced the
matchers, but forgot the remove the explicit setting of mbDeleteMatcher.
Causing mpMatcher to never get deleted even if a new SfxFilterMatcher
was created.

Change-Id: I59f085e1c3ce088f9215be60fb7161364bad0cbe
Reviewed-on: https://gerrit.libreoffice.org/4154Reviewed-by: Noel Power <noel.power@suse.com>
Tested-by: Noel Power <noel.power@suse.com>

sfx2/source/dialog/filedlghelper.cxx

@@ -1828,9 +1828,6 @@ void FileDialogHelper_Impl::addFilters( const String& rFactory,
 
     TSortedFilterList         aIter   (xResult);
 
-    // no matcher any longer used ...
-    mbDeleteMatcher = sal_False;
-
     // append the filters
     OUString sFirstFilter;
     if (OPEN == lcl_OpenOrSave(m_nDialogType))