Fix clippy warning

warning: redundant closure found
   --> src/bin/aocf.rs:207:14
    |
207 |         .map(|f| Aoc::load_json_from(f))
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `Aoc::load_json_from`
    |
    = note: `#[warn(clippy::redundant_closure)]` on by default
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure

aocf_cli/src/bin/aocf.rs

@@ -204,7 +204,7 @@ fn summary(arg_year: Option<i32>, conf_year: i32) -> Result<(), Error> {
     let mut configs: Vec<_> = fs::read_dir(find_root()?.join(".aocf/cache"))?
         .map(|r| r.map(|e| e.path()))
         .flatten()
-        .map(|f| Aoc::load_json_from(f))
+        .map(Aoc::load_json_from)
         .flatten()
         .filter(|a| a.year == Some(year))
         .collect();