Delete extra Matlab gitignore

[jolheiser]

Noticed by @davidsvantesson there were two matlab gitignores, MATLAB and Matlab
It appears MATLAB is the name upstream, so this PR removes the other.

[codecov-io]

Codecov Report

Merging #9479 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #9479      +/-   ##
=========================================
+ Coverage    41.5%   41.5%   +<.01%     
=========================================
  Files         571     571              
  Lines       74609   74609              
=========================================
+ Hits        30964   30966       +2     
+ Misses      39804   39801       -3     
- Partials     3841    3842       +1

Impacted Files	Coverage Δ
services/pull/temp_repo.go	31.62% <0%> (-2.57%)	⬇️
models/repo_list.go	73.14% <0%> (-0.93%)	⬇️
services/mirror/mirror.go	19.4% <0%> (+0.65%)	⬆️
models/repo_mirror.go	12.76% <0%> (+10.63%)	⬆️

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