qml/test: add fake qt.bitcoincore.org module

Author: Johnny Carlson

src/qml/test/org/bitcoincore/qt/AppMode.qml

@@ -0,0 +1,12 @@
+pragma Singleton
+import QtQuick 2.15
+
+Item {
+    property bool isDesktop: true
+    property bool isMobile: false
+    enum Mode {
+        DESKTOP,
+        MOBILE
+    }
+    property string state: "MOBILE"
+}

src/qml/test/org/bitcoincore/qt/qmldir

@@ -0,0 +1,2 @@
+module org.bitcoincore.qt
+singleton AppMode 1.0 AppMode.qml