Filter inactive auth sources (#27870)

Fix nil access for inactive auth sources.

> Render failed, failed to render template:
user/settings/security/security, error: template error:
builtin(static):user/settings/security/accountlinks:32:20 : executing
"user/settings/security/accountlinks" at <$providerData.IconHTML>: nil
pointer evaluating oauth2.Provider.IconHTML

Code tries to access the auth source of an `ExternalLoginUser` but the
list contains only the active auth sources.

routers/web/user/setting/security/security.go

@@ -82,7 +82,7 @@ func loadSecurityData(ctx *context.Context) {
  // map the provider display name with the AuthSource
  sources := make(map[*auth_model.Source]string)
  for _, externalAccount := range accountLinks {
- if authSource, err := auth_model.GetSourceByID(ctx, externalAccount.LoginSourceID); err == nil {
+ if authSource, err := auth_model.GetSourceByID(ctx, externalAccount.LoginSourceID); err == nil && authSource.IsActive {
  var providerDisplayName string
 
  type DisplayNamed interface {