fix: remove unneeded nightly feature flag

A previous versin of PathIterator used `advance_by`. I fell for all the issues described in rust-lang/rust#77404 (comment), and eventually switched to using `nth_back` which has already stabilised.
AaronFeickert · Jul 4, 2023 · a9700ea · a9700ea
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commit a9700ea
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diff --git a/base_layer/mmr/src/lib.rs b/base_layer/mmr/src/lib.rs
@@ -19,7  19,6 @@
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 // USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#![feature(iter_advance_by)]
 //! # Merkle Mountain Ranges
 //!
 //! ## Introduction