treasury: Make consistent checks for isTranscoder

contracts/treasury/GovernorCountingOverridable.sol

@@ -188,6 +188,14 @@ abstract contract GovernorCountingOverridable is Initializable, GovernorUpgradea
             return _weight - _voter.deductions;
         }
 
+        address delegatesDelegate = votes().delegatedAt(delegate, timepoint);
+        bool delegateIsTranscoder = delegate == delegatesDelegate;
+        if (!delegateIsTranscoder) {
+            // do not override votes of non-self-bonding accounts since those don't get their voting power from the sum
+            // of delegations to them, so the override logic doesn't apply.
+            return _weight;
+        }
+
         // this is a delegator, so add a deduction to the delegated transcoder
         ProposalVoterState storage delegateVoter = _tally.voters[delegate];
         delegateVoter.deductions += _weight;