Installer: Missing break

Leading to opening two Installer windows after closing EULA.

Thanks to Diver for reporting!

src/apps/installer/InstallerApp.cpp

@@ -72,6 +72,7 @@ InstallerApp::MessageReceived(BMessage* message)
 	switch (message->what) {
 		case kMsgAgree:
 			fEULAWindow->PostMessage(B_QUIT_REQUESTED);
+			break;
 		case kMsgNext:
 			new InstallerWindow();
 			break;