Elwig: Use ExecuteSql/FromSql instead of ExecuteSqlRaw/FromSqlRaw where possible

Elwig/Models/Dtos/PaymentVariantSummaryData.cs

@@ -49,7 +49,7 @@ namespace Elwig.Models.Dtos {
         }
 
         private static async Task<IEnumerable<PaymentVariantSummaryRow>> FromDbSet(DbSet<PaymentVariantSummaryRow> table, int year, int avnr) {
-            return await table.FromSqlRaw($"""
+            return await table.FromSql($"""
                 SELECT v.type AS type,
                        v.name AS variety,
                        a.name AS attribute,