Add code section for MATLAB expressions in "Remote Read" tutorial

[ehennestad]

Motivation

Cosmetic change to tutorial. This unrelatedly also fixes an issue when compiling matnwb into a standalone application as reported in issue #564

How to test the behavior?

N/A

Checklist

• [x] Have you ensured the PR description clearly describes the problem and solutions?
• [x] Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• [x] If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.63%. Comparing base (afd34b0) to head (7511c33). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #610 +/- ## ======================================= Coverage 90.63% 90.63% ======================================= Files 106 106 Lines 4689 4689 ======================================= Hits 4250 4250 Misses 439 439 ```

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