Test: Enabled tst_QFile::invalidFile

The test is not hanging on Windows anymore.

On Windows, add an expected failure for the failing case.

Task-number: QTBUG-22801
Task-number: QTBUG-27306

Change-Id: Iede95766504f3e8a278a4554a5967ca333aae3bf
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

tests/auto/corelib/io/qfile/tst_qfile.cpp

@@ -229,8 +229,6 @@ private slots:
     void openDirectory();
     void writeNothing();
 
-public:
-// disabled this test for the moment... it hangs
     void invalidFile_data();
     void invalidFile();
 
@@ -1062,6 +1060,7 @@ void tst_QFile::invalidFile()
 {
     QFETCH( QString, fileName );
     QFile f( fileName );
+    QEXPECT_FAIL("colon1", "QTBUG-27306", Continue);
     QVERIFY( !f.open( QIODevice::ReadWrite ) );
 }