Fix summarizing vote results

internal/models/motions.go

@@ -458,13 +458,15 @@ func sumsForDecision(ctx context.Context, tx *sqlx.Tx, d *Motion) (*VoteSums, er
 			return nil, fmt.Errorf("could not parse row for vote sums of motion %s: %w", d.Tag, err)
 		}
 
-		switch vote {
-		case VoteAye:
+		switch vote.ID {
+		case VoteAye.ID:
 			sums.Ayes = count
-		case VoteNaye:
+		case VoteNaye.ID:
 			sums.Nayes = count
-		case VoteAbstain:
+		case VoteAbstain.ID:
 			sums.Abstains = count
+		default:
+			return nil, fmt.Errorf("unknown vote type '%+v'", vote)
 		}
 	}