Enabled the DSI authnetication on dev

Author: FrostyApeOne

src/DfE.ExternalApplications.Api/appsettings.Development.json

@@ -36,7 +36,7 @@
     "DiscoveryEndpoint": "https://test-oidc.signin.education.gov.uk/.well-known/openid-configuration"
   },
   "TestAuthentication": {
-    "Enabled": true,
+    "Enabled": false,
     "JwtSigningKey": "secret",
     "JwtIssuer": "test-external-applications",
     "JwtAudience": "external-applications-api"