mining: add visual icon/indicator that mining is enabled, visible on all the screens

pages/Transfer.qml

@@ -660,6 +660,8 @@ Rectangle {
                 // Light wallet is always ready
                 pageRoot.enabled = true;
                 root.warningContent = "";
+                // check if daemon was already mining and add mining logo if true
+                middlePanel.miningView.update();
             }
         }
     }