remove a use of OUString::intern()

maIconCache is defined as a std::unordered_map
'interning' a OUString to give to it as a key seems completely
superfluous since no-one will ever use it by address, even less
compare the address.

Change-Id: Iab5d106d7d51fcdfbd0a0dfd50ae28d686b9b2b7
Reviewed-on: https://gerrit.libreoffice.org/15692Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/gdi/impimagetree.cxx

@@ -181,7 +181,7 @@ bool ImplImageTree::doLoadImage(OUString const & name, OUString const & style, B
     }
 
     if (found)
-        maIconSet[maCurrentStyle].maIconCache[name.intern()] = std::make_pair(localized, bitmap);
+        maIconSet[maCurrentStyle].maIconCache[name] = std::make_pair(localized, bitmap);
 
     return found;
 }