desktop: fix loplugin:oncevar

Change-Id: I51b5d199c79c644906df355c8fbd33e5c98e7d89
diff --git a/desktop/source/lib/init.cxx b/desktop/source/lib/init.cxx
index ab765dc..0d0cdf2 100644
--- a/desktop/source/lib/init.cxx
+++ b/desktop/source/lib/init.cxx
@@ -2007,7 +2007,7 @@ static void lo_setDocumentPassword(LibreOfficeKit* pThis,

static char* lo_getVersionInfo(LibreOfficeKit* /*pThis*/)
{
    const OUString sVersionStrTemplate(
    static const OUString sVersionStrTemplate(
        "{ "
        "\"ProductName\": \"%PRODUCTNAME\", "
        "\"ProductVersion\": \"%PRODUCTVERSION\", "