Virtual Monitor: Replace the video-monitor icon with something that exists

There is no "video-monitor" in Breeze Icons, so it inappropriately falls
back to "video" icon which looks like a file icon rather than a device.

plasmoid/package/contents/ui/DeviceDelegate.qml

@@ -188,7 +188,7 @@ PlasmaComponents.ItemDelegate {
             }
 
             PlasmaComponents.ToolButton {
-                icon.name: "video-monitor"
+                icon.name: "krdc"
                 visible: virtualmonitor.available
                 text: i18n("Virtual Display")
                 onClicked: {

plugins/virtualmonitor/kdeconnect_virtualmonitor.json

@@ -61,7 +61,7 @@
         "Description[zh_CN]": "使用您的设备作为虚拟显示器",
         "Description[zh_TW]": "將您的裝置作為虛擬螢幕使用",
         "EnabledByDefault": true,
-        "Icon": "video-monitor",
+        "Icon": "krdc",
         "License": "GPL",
         "Name": "Virtual Monitor",
         "Name[ar]": "شاشة افتراضية",