Fix 'Redundant blank line at the end of a code block should be deleted.' issue in source\SQLInjection.cpp

[CodeFactor](https://www.codefactor.io/repository/github/rowland007/sql-injection-activity) found an issue: Redundant blank line at the end of a code block should be deleted.

It's currently on:
[source\SQLInjection.cpp:167](https://www.codefactor.io/repository/github/rowland007/sql-injection-activity/source/master/source/SQLInjection.cpp#L167)
Commit 37b0aa5f28ca735641312d74f139877e49c34496