Deploy steps: Hide details button if applicable

Task-number: QTCREATORBUG-6674

Change-Id: I3cca8a75b1108f4fede09191cfed76c8fcf44c0e
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>
Reviewed-by: Paweł Polański <pawel.3.polanski@nokia.com>

src/plugins/remotelinux/tarpackagecreationstep.cpp

@@ -69,6 +69,8 @@ public:
 
     QString displayName() const { return QString(); }
 
+    bool showWidget() const { return false; }
+
 private:
     const TarPackageCreationStep * const m_step;
 };