Fix type conversions error in SW

1. Open Workflow Designer
2. Load sample "Trim and Map Sanger reads"
3. Add the attach file as read and reference.
4. Run workflow.
   Current: `PairwiseAlignmentSmithWatermanTask` throws the `bad_alloc` exception, the error message "There is not enough memory to finish the task" in the log on the "Trace" level.

Reason: SmithWatermanAlgorithm.cpp -> 176 memory size variable is incorrect because of the implicit conversation from `unsigned int` to `int`.