[Service Runner] Don't use KRun::runService

It blocks KRunner while the application is loading and in some cases
(like Kate's session selection dialog) might never return.

BUG: 361917
FIXED-IN: 5.7.0

Differential Revision: https://phabricator.kde.org/D1769

runners/services/servicerunner.cpp

@@ -292,7 +292,7 @@ void ServiceRunner::run(const Plasma::RunnerContext &context, const Plasma::Quer
             QStringLiteral("org.kde.krunner")
         );
 
-        KRun::runService(*service, {}, nullptr);
+        new KRun(QUrl::fromLocalFile(service->entryPath()), nullptr, true);
     }
 }