Android: fix warning from Java compiler about redundant cast

ConnectivityManager::getDefaultProxy already returns a ProxyInfo object,
no need to cast.

Change-Id: I808be775cb03d47c7bb1b20122597697f1f977a1
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/network/android/jar/src/org/qtproject/qt/android/network/QtNetwork.java

@@ -58,7 +58,7 @@ static ConnectivityManager getConnectivityManager(final Context context)
     static ProxyInfo getProxyInfo(final Context context)
     {
         if (m_proxyInfo == null)
-            m_proxyInfo = (ProxyInfo)getConnectivityManager(context).getDefaultProxy();
+            m_proxyInfo = getConnectivityManager(context).getDefaultProxy();
         return m_proxyInfo;
     }
 }