SvNumberFormatsSupplierServiceObject: default to LANGUAGE_SYSTEM

... instead of LANGUAGE_ENGLISH_US that will be ultimate fall-back
anyway if no match is found.

Change-Id: Ice6495e54fa0a1e275769fcfdf1e0e932e22944e
Reviewed-on: https://gerrit.libreoffice.org/61729Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>

svl/source/numbers/supservs.cxx

@@ -75,7 +75,7 @@ void SAL_CALL SvNumberFormatsSupplierServiceObject::initialize( const Sequence<
     }
 
     Type aExpectedArgType = ::cppu::UnoType<css::lang::Locale>::get();
-    LanguageType eNewFormatterLanguage = LANGUAGE_ENGLISH_US;
+    LanguageType eNewFormatterLanguage = LANGUAGE_SYSTEM;
         // the default
 
     const Any* pArgs = _rArguments.getConstArray();