[GH-199] fixed unquoted oldColumnName when changing column definition in MySQL

This issue is created automatically through a Github pull request on behalf of lutzportela:

Message:

before:
```ALTER TABLE AlertCondition CHANGE fulltext `fulltext` VARCHAR(255) DEFAULT NULL``` failed.

after:
```ALTER TABLE AlertCondition CHANGE `fulltext` `fulltext` VARCHAR(255) DEFAULT NULL``` passes.

Field	Original Value	New Value
Status	Open [ 1 ]	Resolved [ 5 ]
Resolution		Can't Fix [ 7 ]

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