Auth provider title and image override do not work for auth providers with '-' in it

[derkoe]

Describe the issue

The new feature to override the name and image for an auth provider (introduced in 159ae59) does not work for auth providers with '-' in them.

I already tried

Describe the steps you tried to solve the problem yourself.

• I've read and searched the docs and did not find the answer there.
  If you didn’t try already, try to search there what you wrote above.

To Reproduce the issue

Steps to reproduce the behavior:

1. Add an auth to your settings - e.g. SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_KEY
2. Set the title and image override (SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_TITLE and SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_IMAGE)
3. Go to the login page
4. The title and image are not overriden

Expected behavior

The title and image should be overridden.

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