Do not cast sal_Unicode separator to sal_Char

... living in an ASCII world?

Change-Id: I82912924420766734573a10b2e110fef6fcadd1c
Reviewed-on: https://gerrit.libreoffice.org/43343Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>

connectivity/source/commontools/predicateinput.cxx

@@ -64,7 +64,7 @@ namespace dbtools
 
         sal_Unicode nReturn( _nFallback );
         if ( !_rSeparator.isEmpty() )
-            nReturn = static_cast< sal_Char >( _rSeparator[0] );
+            nReturn = _rSeparator[0];
         return nReturn;
     }