fix: remove slashValidator gating on active status (#448)

Causing failures on deployment throwing with:

```
2026-06-26 05:53:29.875	
Error: InCorrectCurrentTargetUnslashedBalance
2026-06-26 05:53:29.875	
    at BeaconChain.verifyBlocksInEpoch (file:///usr/src/lodestar/packages/beacon-node/src/chain/blocks/verifyBlock.ts:176:7)
2026-06-26 05:53:29.875	
    at JobItemQueue.runJob (file:///usr/src/lodestar/packages/beacon-node/src/util/queue/itemQueue.ts:149:22)
2026-06-26 05:53:29.875	
    at NativeBeaconStateView.stateTransition (file:///usr/src/lodestar/packages/state-transition/src/stateView/nativeBeaconStateView.ts:661:54)
```

See:
https://github.com/ChainSafe/lodestar/blob/848b01419b92832ea4d0d6b32595641e3cf5cd75/packages/state-transition/src/block/slashValidator.ts#L87-L95

Author: spiral-ladder

src/state_transition/block/slash_validator.zig

@@ -10,8 +10,6 @@ const SlashingsCache = @import("../cache/slashings_cache.zig").SlashingsCache;
 const decreaseBalance = @import("../utils/balance.zig").decreaseBalance;
 const increaseBalance = @import("../utils/balance.zig").increaseBalance;
 const initiateValidatorExit = @import("./initiate_validator_exit.zig").initiateValidatorExit;
-const computePreviousEpoch = @import("../utils/epoch.zig").computePreviousEpoch;
-const isActiveValidatorView = @import("../utils/validator.zig").isActiveValidatorView;
 const getBeaconProposer = @import("../cache/get_beacon_proposer.zig").getBeaconProposer;
 
 /// Same to https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.5/specs/altair/beacon-chain.md#has_flag
@@ -93,20 +91,16 @@ pub fn slashValidator(
     }
 
     if (fork.gte(.altair)) {
-        const previous_epoch = computePreviousEpoch(epoch);
-        const is_active_previous_epoch = try isActiveValidatorView(validator, previous_epoch);
-        const is_active_current_epoch = try isActiveValidatorView(validator, epoch);
-
         var previous_participation = try state.previousEpochParticipation();
-        if (is_active_previous_epoch and (try previous_participation.get(@intCast(slashed_index))) & TIMELY_TARGET == TIMELY_TARGET) {
+        if ((try previous_participation.get(@intCast(slashed_index))) & TIMELY_TARGET == TIMELY_TARGET) {
             if (epoch_cache.previous_target_unslashed_balance_increments < slashed_effective_balance_increments) {
                 return error.PreviousTargetUnslashedBalanceUnderflow;
             }
             epoch_cache.previous_target_unslashed_balance_increments -= slashed_effective_balance_increments;
         }
 
         var current_participation = try state.currentEpochParticipation();
-        if (is_active_current_epoch and (try current_participation.get(@intCast(slashed_index))) & TIMELY_TARGET == TIMELY_TARGET) {
+        if ((try current_participation.get(@intCast(slashed_index))) & TIMELY_TARGET == TIMELY_TARGET) {
             if (epoch_cache.current_target_unslashed_balance_increments < slashed_effective_balance_increments) {
                 return error.CurrentTargetUnslashedBalanceUnderflow;
             }