runk: Fix needless_borrow warning

As we bumped the rust toolchain to 1.66.0, some new warnings have been
raised due to needless_borrow.

Let's fix them all here.

For more info about the warnings, please, take a look at:
https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

src/tools/runk/src/main.rs

@@ -105,7 +105,7 @@ fn setup_logger(
             .read(true)
             .create(true)
             .truncate(true)
-            .open(&file)?;
+            .open(file)?;
 
         // TODO: Support 'text' log format.
         let (logger_local, logger_async_guard_local) =