ModeSelect: Gate inclusion of on-off-server.h based on whether an on-…

…off cluster is present in the app (#26263)

* Gate inclusion of on-off-server.h based on whether an on-off cluster is present in the application. Build fails when no on-off cluster is present.

* Need to move the gate so that it's after #include <app/util/config.h> so that the macro gating macro is defined. It seems the headers includes have changed between the version of the file I was using (compnay-internal fork) and the one in master.

src/app/clusters/mode-select-server/mode-select-server.cpp

@@ -24,7 +24,6 @@
 #include <app/CommandHandler.h>
 #include <app/ConcreteCommandPath.h>
 #include <app/clusters/mode-select-server/supported-modes-manager.h>
-#include <app/clusters/on-off-server/on-off-server.h>
 #include <app/util/af.h>
 #include <app/util/attribute-storage.h>
 #include <app/util/config.h>
@@ -34,6 +33,10 @@
 #include <lib/support/CodeUtils.h>
 #include <platform/DiagnosticDataProvider.h>
 
+#ifdef EMBER_AF_PLUGIN_ON_OFF
+#include <app/clusters/on-off-server/on-off-server.h>
+#endif // EMBER_AF_PLUGIN_ON_OFF
+
 using namespace std;
 using namespace chip;
 using namespace chip::app;