remove Base64Str type from altcha

This was decoding the string, which the altcha validator expects to do itself. Now it works.

slopserver/settings.py

@@ -0,0 +1,9 @@
+from pydantic_settings import BaseSettings
+
+
+class ServerSettings(BaseSettings):
+    db_url: str = "sqlite+pysqlite:///test_db.sqlite"
+    token_secret: str = "5bcc778a96b090c3ac1d587bb694a060eaf7bdb5832365f91d5078faf1fff210"
+    altcha_secret: str = "0460de065912d0292df1e7422a5ed2dc362ed56d6bab64fe50b89957463061f3"
+
+settings = ServerSettings()