Update README.md

Set the first Open in MATLAB Online badge to open to the README.

Author: eszmw

README.md

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 # <span style="color:rgb(213,80,0)">Fundamentals of Probability Theory</span>
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-[![View on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/100546-probability-theory) or [![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=MathWorks-Teaching-Resources/Probability-Theory&project=Probability.prj)
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 **Curriculum Module**