Correcting syntax output for AlterColumnExpression, so Shannon's migrations will work

src/Umbraco.Core/Persistence/Migrations/Syntax/Alter/Expressions/AlterColumnExpression.cs

@@ -21,9 +21,13 @@ namespace Umbraco.Core.Persistence.Migrations.Syntax.Alter.Expressions
 
         public override string ToString()
         {
-            return string.Format(SqlSyntaxContext.SqlSyntaxProvider.AlterColumn,
-                                 SqlSyntaxContext.SqlSyntaxProvider.GetQuotedTableName(TableName),
-                                 SqlSyntaxContext.SqlSyntaxProvider.GetQuotedColumnName(Column.Name));
+            string columnNameFormat = string.Format("{0} {1}",
+                SqlSyntaxContext.SqlSyntaxProvider.GetQuotedColumnName(Column.Name),
+                SqlSyntaxContext.SqlSyntaxProvider.Format(Column));
+
+            return string.Format(SqlSyntaxContext.SqlSyntaxProvider.AlterColumn, 
+                                SqlSyntaxContext.SqlSyntaxProvider.GetQuotedTableName(TableName),
+                                columnNameFormat);
         }
     }
 }