Fix login in loginModal for all controllers and update to 0.12.4

[davidbeig]

In #427 we found that hashcash was not valid when login inside components. It turns out it didn't work in initiatives and conferences. Therefore we have added the needed concern to the Decidim::ApplicationController base controller.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.03%. Comparing base (1fcf371) to head (6c08e6e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #430   +/-   ##
=======================================
  Coverage   97.03%   97.03%           
=======================================
  Files         154      154           
  Lines        3986     3986           
=======================================
  Hits         3868     3868           
  Misses        118      118           

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[microstudi]

great!