Allow the openURLJob to run executables

Otherwise, excecutable files like AppImages won't be allowed to launch
even if they are correctly marked as executable.

BUG: 429603
FIXED-IN: 20.12

src/dolphinviewcontainer.cpp

@@ -638,6 +638,7 @@ void DolphinViewContainer::slotItemActivated(const KFileItem& item)
     }
 
     KIO::OpenUrlJob *job = new KIO::OpenUrlJob(item.targetUrl());
+    job->setRunExecutables(true);
     job->setUiDelegate(new KIO::JobUiDelegate(KJobUiDelegate::AutoHandlingEnabled, this));
     job->setShowOpenOrExecuteDialog(true);
     job->start();