tdf#158068: Replace with static constexpr O(U)String

Change-Id: Ie2f1e821451a692a79c40dd4d40dc89a9fa550c4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/176803
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

desktop/source/app/crashreport.cxx

@@ -188,13 +188,13 @@ OUString CrashReporter::getLoggedUnoCommands()
 {
     osl::MutexGuard aGuard(maUnoLogCmdMutex);
 
-    OUString aCommandSeperator="";
+    std::u16string_view aCommandSeperator;
     OUStringBuffer aUnoCommandBuffer;
 
     for( auto& unocommand: maloggedUnoCommands)
     {
         aUnoCommandBuffer.append(aCommandSeperator + unocommand);
-        aCommandSeperator=",";
+        aCommandSeperator=u","_ustr;
     }
     return aUnoCommandBuffer.makeStringAndClear();
 }