Fix test_parse_callback_interval_valid test

The test was failing because parse_callback_interval() now returns
anyhow::Result<u64> instead of u64. Updated the test to properly
unwrap the Result before comparison.

Co-authored-by: Hulto <hulto@users.noreply.github.com>

Author: github-actions[bot]

implants/lib/pb/src/config.rs

@@ -344,7 +344,7 @@ mod tests {
 
     #[test]
     fn test_parse_callback_interval_valid() {
-        let interval = parse_callback_interval();
+        let interval = parse_callback_interval().expect("Failed to parse callback interval");
         // Should parse successfully or default to DEFAULT_INTERVAL_SECONDS
         assert!(interval >= DEFAULT_INTERVAL_SECONDS);
     }