Submit() script needs to be fixed for MATLAB 2019B

[dylancis]

https://github.com/tuanavu/coursera-stanford/blob/f6f8087e3db936e1125ae590edcb6d3f189c1d8b/machine_learning/exercises/matlab/submitWithConfiguration.m#L5

In MATLAB 2019B, you cannot use the same name of variable and function, because the JIT will consider the PARTS as variable and overshadow your function. This change is new for R2019B, please read the Release Note for more information. In anycase use the same name for VARIABLE and FUNCTION is evidently a terrible way of programming (I see the same happens inside the body of PARTS function).