Rename test to comply with coding conventions.

Test was inappropriately named according to
https://wiki.qt.io/Writing_Unit_Tests#Naming_of_test_functions_is_important

Task-number: QTBUG-51288
Change-Id: I1c97cee80b5fbf41182b9472ba683862a576b83c
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@theqtcompany.com>

tests/auto/network/socket/qtcpserver/tst_qtcpserver.cpp

@@ -106,7 +106,7 @@ private slots:
 
     void eagainBlockingAccept();
 
-    void qtbug51288();
+    void canAccessPendingConnectionsWhileNotListening();
 
 private:
 #ifndef QT_NO_BEARERMANAGEMENT
@@ -1001,7 +1001,7 @@ public:
     }
 };
 
-void tst_QTcpServer::qtbug51288()
+void tst_QTcpServer::canAccessPendingConnectionsWhileNotListening()
 {
     NonListeningTcpServer server;
     QTcpSocket socket;