fix: default to strict TLS checks if not configured

If user has not set any settings manually
and provider is not configured,
default to strict TLS checks.

Bug was introduced in
<https://github.com/deltachat/deltachat-core-rust/pull/5854>
(commit 6b4532a08e)
and affects released core 1.142.4 and 1.142.5.

The problem only affects accounts configured
using these core versions with provider
not in the provider database or when using advanced settings.

src/login_param.rs

@@ -265,9 +265,7 @@ impl LoginParam {
             | CertificateChecks::AcceptInvalidCertificates2 => Some(false),
         };
         let provider_strict_tls = self.provider.map(|provider| provider.opt.strict_tls);
-        user_strict_tls
-            .or(provider_strict_tls)
-            .unwrap_or(self.socks5_config.is_some())
+        user_strict_tls.or(provider_strict_tls).unwrap_or(true)
     }
 }