CMake: Reset process in fileapi reader once it is done

This is what made "Run CMake" only work every second attempt.

Change-Id: If539941138072504225fa6461379f92a0991deac
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/fileapireader.cpp

@@ -294,6 +294,8 @@ void FileApiReader::cmakeFinishedState(int code, QProcess::ExitStatus status)
     Q_UNUSED(code)
     Q_UNUSED(status)
 
+    m_cmakeProcess.release()->deleteLater();
+
     endState(m_fileApi->scanForCMakeReplyFile());
 }