fix(delta): fix the wrong table prefix

[motou]

Description

during the migration of delta data, if the source table has a table prefix and the destination table doesn't have a table prefix or other prefixes, the migration process fails and tells that the destination table could not be found.

Fixed Issues (if relevant)

1. magento/data-migration-tool#: Issue title
2. ...

Manual testing scenarios

1. In the config file app/code/Vendor/Migration/etc/opensource-to-opensource/1.9.2.0/config.xml, in the section options, define different table prefixes like:

       <source_prefix>magento_</source_prefix>
       <dest_prefix />

2. run the CLI command bin/magento migrate:delta -a app/code/Vendor/Migration/etc/opensource-to-opensource/1.9.2.0/config.xml

Contribution checklist

• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [ ] All new or changed code is covered with unit/integration tests (if applicable)

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Hi @motou, thank you for your contribution!
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Your feedback will help us to improve contribution process.