fix: clippy issues with config (#5334)

Description
---
Apply the mut to the config only when unix and libtor flag is used.
Otherwise that piece of code (the one where mut is actually needed) is
never used and then clippy complains that `mut` is not necessary.


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Breaking Changes
---

- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

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applications/tari_base_node/src/main.rs

@@ -130,7 +130,10 @@ fn main_inner() -> Result<(), ExitError> {
         consts::APP_VERSION
     );
 
+    #[cfg(all(unix, feature = "libtor"))]
     let mut config = ApplicationConfig::load_from(&cfg)?;
+    #[cfg(not(all(unix, feature = "libtor")))]
+    let config = ApplicationConfig::load_from(&cfg)?;
     debug!(target: LOG_TARGET, "Using base node configuration: {:?}", config);
 
     // Load or create the Node identity