Debugger: Require only a valid debugger in Kit selection

Lately, Kit::isValid() defaults to also checking e.g. cmake
configuration which is pretty irrelevant for this use case here.

Change-Id: Idfe3bf4b8836a9b8974473c95048cd853276f9c2
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggerdialogs.cpp

@@ -225,6 +225,9 @@ StartApplicationDialog::StartApplicationDialog(QWidget *parent)
     setWindowTitle(tr("Start Debugger"));
 
     d->kitChooser = new KitChooser(this);
+    d->kitChooser->setKitMatcher([this](const Kit *k) {
+        return DebuggerKitInformation::isValidDebugger(k);
+    });
     d->kitChooser->populate();
 
     d->serverPortLabel = new QLabel(tr("Server port:"), this);