GH-3530: Remove trailing comma and space from last column in table generation.

Author: David Ellingsworth

src/NHibernate.Test/NHSpecificTest/GH3530/Fixture.cs

@@ -58,7 +58,7 @@ private void CreateTable(string name)
 
 			// Generate columns
 			sb.Append($"Id {guidType}, ");
-			sb.Append($"Value {stringType}, ");
+			sb.Append($"Value {stringType}");
 
 			// Add the primary key contraint for the identity column
 			sb.Append($", {Dialect.PrimaryKeyString} ( Id )");