katesessionmanager: Make Actions of desktop file start new instance of Kate

Otherwise, we attach to an existing instance.
The runner and Applet also start a new instance.

BUG: 461184

apps/lib/session/katesessionmanager.cpp

@@ -644,7 +644,7 @@ void KateSessionManager::updateJumpListActions(const QStringList &sessionList)
 
         KConfigGroup grp = df->actionGroup(action);
         grp.writeEntry(QStringLiteral("Name"), session);
-        grp.writeEntry(QStringLiteral("Exec"), QStringLiteral("kate -s %1").arg(KShell::quoteArg(session))); // TODO proper executable name?
+        grp.writeEntry(QStringLiteral("Exec"), QStringLiteral("kate -n -s %1").arg(KShell::quoteArg(session)));
     }
 
     df->desktopGroup().writeXdgListEntry("Actions", newActions);