CMake: Make sure to never trigger a timer on an destroyed object

This object might have gone out of scope by the time the timer hits.

Task-number: QTCREATORBUG-17289
Change-Id: I4b9ea75c9b4b1c905ece44965e80a5accc3590f3
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/cmakeprojectmanager/servermode.cpp

@@ -112,7 +112,7 @@ ServerMode::ServerMode(const Environment &env,
     m_cmakeProcess->setCommand(cmakeExecutable.toString(), argumentString);
 
     // Delay start:
-    QTimer::singleShot(0, [argumentString, this] {
+    QTimer::singleShot(0, this, [argumentString, this] {
         emit message(tr("Running \"%1 %2\" in %3.")
                      .arg(m_cmakeExecutable.toUserOutput())
                      .arg(argumentString)