Redirect to login if superadmin registration fails (most likely because Gameyfin has already been set up)

app/src/main/frontend/views/SetupView.tsx

@@ -85,6 +85,7 @@ function SetupView() {
                     initialValues={{username: '', email: '', password: '', passwordRepeat: ''}}
                     onSubmit={
                         async (values: any) => {
+                            try {
                                 await SetupEndpoint.registerSuperAdmin({
                                     username: values.username,
                                     password: values.password,
@@ -94,10 +95,18 @@ function SetupView() {
                                     title: "Setup finished",
                                     description: "Have fun with Gameyfin!",
                                     color: "success"
-                            })
+                                });
+                            } catch (e) {
+                                addToast({
+                                    title: "Could not register super admin user",
+                                    description: "Maybe Gameyfin is already set up?",
+                                    color: "warning"
+                                });
+                            } finally {
                                 navigate('/login');
                             }
                         }
+                    }
                 >
                     <WizardStep icon={<HandWaving/>}>
                         <WelcomeStep/>