Increase timeout for tst_QXmlSimpleReader::inputFromSocket() test

The test tst_QXmlSimpleReader::inputFromSocket() is failing with
"QTestLib: This test case check ("(((server->listening)))") failed
because the requested timeout (5000 ms) was too short, 11700 ms would
have been sufficient this time".
Increased the timeout, since it's better to wait than to fail.

Task-number: QTBUG-63539
Change-Id: I804549648ea834e41d3c87871f5bab90f209385c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/xml/sax/qxmlsimplereader/tst_qxmlsimplereader.cpp

@@ -562,7 +562,7 @@ void tst_QXmlSimpleReader::inputFromSocket()
     QSKIP("WinRT does not support connecting to localhost");
 #endif
 
-    QTRY_VERIFY(server->listening);
+    QTRY_VERIFY_WITH_TIMEOUT(server->listening, 15000);
 
     QTcpSocket sock;
     sock.connectToHost(QHostAddress::LocalHost, TEST_PORT);