templates: conditionally set created automatic column

This change takes into account if the the created automatic column was
set by the user in the update operation. If set, it will set the one
provided by the user. If not set, it will set to the default
"created_at" value.

templates/main/16_update.go.tpl

@@ -71,7 +71,7 @@ func (o *{{$alias.UpSingular}}) Update({{if .NoContext}}exec boil.Executor{{else
 		{{end}}
 		{{if not .NoAutoTimestamps}}
 		if !columns.IsWhitelist() {
-			wl = strmangle.SetComplement(wl, []string{"created_at"})
+			wl = strmangle.SetComplement(wl, []string{"{{or $.AutoColumns.Created "created_at"}}"})
 		}
 		{{end -}}
 		if len(wl) == 0 {