Give QApplication dummy arguments

QApplication takes the command line arguments and parses them itself
for some built in command line arguments that it has. We don't want
any of those built in arguments, so instead give it dummy arguments.

src/qt/bitcoin.h

@@ -56,7 +56,7 @@ class BitcoinApplication: public QApplication
 {
     Q_OBJECT
 public:
-    explicit BitcoinApplication(interfaces::Node& node, int &argc, char **argv);
+    explicit BitcoinApplication(interfaces::Node& node);
     ~BitcoinApplication();
 
 #ifdef ENABLE_WALLET