const OUString -> const OUStringLiteral

Mostly automated rewrite

Change-Id: Ie020a083f898bc126b8fb039d4ecb2e687172da1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112965
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

cpputools/source/unoexe/unoexe.cxx

@@ -91,7 +91,7 @@ const char arUsingText[] =
 static bool readOption( OUString * pValue, const char * pOpt,
                         sal_uInt32 * pnIndex, const OUString & aArg)
 {
-    const OUString dash("-");
+    static const OUStringLiteral dash(u"-");
     if(!aArg.startsWith(dash))
         return false;