Fix postponing when code model is parsed

If postponing a full parse unset an already postponed partial parse
otherwise we could run into the Q_ASSERT statement inside
onPartialParsingFinished().

Change-Id: Iee197f1e16496ea87975d5ead0e43953353ab9a7
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

plugins/autotest/testcodeparser.cpp

@@ -117,6 +117,8 @@ void TestCodeParser::updateTestTree()
     m_singleShotScheduled = false;
     if (m_codeModelParsing) {
         m_fullUpdatePostponed = true;
+        m_partialUpdatePostponed = false;
+        m_postponedFiles.clear();
         return;
     }