Fix open redirect in login and logout return urls

[dreese33]

Fix #101

I tested this against the product I'm currently using this package in. Also ran tests locally to verify change:

[packit-as-a-service]

Failed to load packit config file:

Cannot parse package config. ValidationError({'jobs': {6: {'job': ['Invalid enum member production_build']}}})

For more info, please check out the documentation or contact the Packit team. You can also use our CLI command validate-config or our pre-commit hooks for validation of the configuration.

[packit-as-a-service]

Failed to load packit config file:

Cannot parse package config. ValidationError({'jobs': {6: {'job': ['Invalid enum member production_build']}}})

For more info, please check out the documentation or contact the Packit team. You can also use our CLI command validate-config or our pre-commit hooks for validation of the configuration.

[packit-as-a-service]

Failed to load packit config file:

Cannot parse package config. ValidationError({'jobs': {6: {'job': ['Invalid enum member production_build']}}})

For more info, please check out the documentation or contact the Packit team. You can also use our CLI command validate-config or our pre-commit hooks for validation of the configuration.