Increase varchar for sourceid1 column

Problem/Motivation

The varchar limit for migrate_map_path_redirect_import table sourceid1 column (255) does not match the varchar limit for redirect table redirect_source__path column (2048).

Somewhere around 2048 is generally the accepted max length of a URL. The Redirect module has chosen 2048, so if this module is meant to build on the functionality that module provides, it should accept the same max varchar.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes