Fix uniform noise generation for events

[maxime-vaillant]

In the original UniformNoise implementation, x, y and polarity was randomly chosen using float values. For x and y it might not be a problem because of integer casting later, but for polarity it lead to a random choice of values center in 1, so most of polarity event generated will be casted in 1.

Fixing implementation : use np.random.randint for x, y and p instead of np.random.uniform.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.50%. Comparing base (a4e8a45) to head (f26c6ed).
⚠️ Report is 136 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #322      +/-   ##
===========================================
- Coverage    77.07%   76.50%   -0.58%     
===========================================
  Files           54       48       -6     
  Lines         3067     2992      -75     
===========================================
- Hits          2364     2289      -75     
  Misses         703      703              

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