xmlpatternsdiagnosticsts test: use correct baseline

At least on OS X, the test would use the baseline of xmlpatternsxqts
since that's where tst_suitetest.h is. QFINDTESTDATA would then resolve
Baseline.xml relative to that.

Change-Id: I860d7e3143365b33901f721caed813d4d594f28d
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

tests/auto/xmlpatternsdiagnosticsts/tst_xmlpatternsdiagnosticsts.cpp

@@ -55,6 +55,7 @@ protected:
 
 tst_XmlPatternsDiagnosticsTS::tst_XmlPatternsDiagnosticsTS() : tst_SuiteTest(tst_SuiteTest::XQuerySuite, true)
 {
+    m_existingBaseline = QFINDTESTDATA("Baseline.xml");
 }
 
 void tst_XmlPatternsDiagnosticsTS::catalogPath(QString &write) const

tests/auto/xmlpatternsxqts/tst_suitetest.h

@@ -83,12 +83,12 @@ private Q_SLOTS:
     void runTestSuite() const;
     void checkTestSuiteResult() const;
 
-private:
+protected:
     /**
      * An absolute path to the catalog.
      */
     QString         m_catalogPath;
-    const QString   m_existingBaseline;
+    QString   m_existingBaseline;
     const QString   m_candidateBaseline;
     const bool      m_abortRun;
     const SuiteType m_suiteType;