stake() will block adding a cooldown on creation && fix bug with chan…

…ging delegate to self

programs/voter-stake-registry/src/instructions/change_delegate.rs

@@ -116,8 +116,8 @@ pub fn change_delegate(ctx: Context<ChangeDelegate>, deposit_entry_index: u8) ->
             MplStakingError::InvalidMining
         );
         target.delegate = delegate_voter.voter_authority;
-        target.delegate_last_update_ts = curr_ts;
     }
+    target.delegate_last_update_ts = curr_ts;
 
     let reward_pool = ctx.accounts.reward_pool.to_account_info();
     let mining = ctx.accounts.deposit_mining.to_account_info();

programs/voter-stake-registry/src/instructions/stake.rs

@@ -1,4 +1,4 @@
-use crate::{cpi_instructions, Stake};
+use crate::{clock_unix_timestamp, cpi_instructions, Stake};
 use anchor_lang::prelude::*;
 use mplx_staking_states::{error::MplStakingError, state::LockupKind};
 
@@ -60,6 +60,7 @@ pub fn stake(
         .amount_deposited_native
         .checked_add(amount)
         .ok_or(MplStakingError::ArithmeticOverflow)?;
+    target.delegate_last_update_ts = clock_unix_timestamp();
 
     let reward_pool = ctx.accounts.reward_pool.to_account_info();
     let mining = ctx.accounts.deposit_mining.to_account_info();