Remove n_users from RBM constructor

[pradnyeshjoshi]

Description

Removed n_users argument from RBM constructor as it is not needed there. (It is only needed in the fit function and equals to the number of rows in the training set.)

Related Issues

Checklist:

• I have followed the contribution guidelines and code style for this project.
• I have added tests covering my contributions.
• I have updated the documentation accordingly.
• This PR is being made to staging branch and not to main branch.

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Codecov Report

Merging #1622 (48a9154) into staging (cf7bfd8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           staging    #1622   +/-   ##
========================================
  Coverage    56.68%   56.68%           
========================================
  Files           88       88           
  Lines         8956     8956           
========================================
  Hits          5077     5077           
  Misses        3879     3879           

Flag	Coverage Δ
pr-gate	56.68% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
recommenders/models/rbm/rbm.py	83.60% <100.00%> (ø)

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[miguelgfierro]

great!