fix: index for getOperatorRestakeableStrategies (#4090)

### Description

Creates a fix for a view function an indexer on the EigenLayer side
calls into for UI display

### Drive-by changes

None

### Related issues

N/A

### Backward compatibility

Yes

### Testing

Regression test added in the Eigenlayer repo

solidity/contracts/avs/ECDSAServiceManagerBase.sol

@@ -248,7 +248,6 @@ abstract contract ECDSAServiceManagerBase is
         uint256[] memory shares = IDelegationManager(delegationManager)
             .getOperatorShares(_operator, strategies);
 
-        address[] memory activeStrategies = new address[](count);
         uint256 activeCount;
         for (uint256 i; i < count; i++) {
             if (shares[i] > 0) {
@@ -258,9 +257,11 @@ abstract contract ECDSAServiceManagerBase is
 
         // Resize the array to fit only the active strategies
         address[] memory restakedStrategies = new address[](activeCount);
+        uint256 index;
         for (uint256 j = 0; j < count; j++) {
             if (shares[j] > 0) {
-                restakedStrategies[j] = activeStrategies[j];
+                restakedStrategies[index] = address(strategies[j]);
+                index++;
             }
         }