add recycle alpha helper function

Author: open-junius

pallets/subtensor/src/coinbase/run_coinbase.rs

@@ -830,7 +830,7 @@ impl<T: Config> Pallet<T> {
                 parent_emission = parent_emission.saturating_sub(child_take);
                 total_child_take = total_child_take.saturating_add(child_take);
 
-                Self::burn_subnet_alpha(
+                Self::recycle_subnet_alpha(
                     netuid,
                     AlphaCurrency::from(burn_take.saturating_to_num::<u64>()),
                 );

pallets/subtensor/src/staking/helpers.rs

@@ -322,7 +322,7 @@ impl<T: Config> Pallet<T> {
         T::SwapInterface::is_user_liquidity_enabled(netuid)
     }
 
-    pub fn burn_subnet_alpha(netuid: NetUid, amount: AlphaCurrency) {
+    pub fn recycle_subnet_alpha(netuid: NetUid, amount: AlphaCurrency) {
         SubnetAlphaOut::<T>::mutate(netuid, |total| {
             *total = total.saturating_sub(amount);
         });

pallets/subtensor/src/staking/recycle_alpha.rs

@@ -59,9 +59,7 @@ impl<T: Config> Pallet<T> {
         );
 
         // Recycle means we should decrease the alpha issuance tracker.
-        SubnetAlphaOut::<T>::mutate(netuid, |total| {
-            *total = total.saturating_sub(actual_alpha_decrease);
-        });
+        Self::recycle_subnet_alpha(netuid, amount);
 
         Self::deposit_event(Event::AlphaRecycled(
             coldkey,