Fix double-encoded filter name in date range inputs

[Varlin]

Issue : The filters based on datepicker range filters send wrong URLs when the date property contains special characters like accents.

Exemple : "?_lower_Date_de_d%25C3%25A8s" instead of "?_lower_Date_de_décès=2020-02-13..."

Cause : In GetApplicableFilters::getUnappliedFilterLine(), $filter_name is built with urlencode() for use in link URLs. This encoded value is also passed to getDateRangeInput(), causing the attributes to contain already-encoded characters (e.g. "Date_de_d%C3%A8s"). When the browser submits the form, it encodes them a second time (e.g. "Date_de_d%25C3%25A8s"), which no longer matches the filter name expected by SpecialBrowseData, so the date range filter has no effect.

Fix: pass the raw (non-encoded) filter name to getDateRangeInput(), just replacing white spaces with underscores.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.61%. Comparing base (1c054e5) to head (cdfd60e).

❗ There is a different number of reports uploaded between BASE (1c054e5) and HEAD (cdfd60e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (1c054e5)	HEAD (cdfd60e)
	2	1

Additional details and impacted files

@@              Coverage Diff              @@
##             master     #136       +/-   ##
=============================================
- Coverage     77.70%   34.61%   -43.10%     
=============================================
  Files            36        1       -35     
  Lines          2373       52     -2321     
  Branches          7        7               
=============================================
- Hits           1844       18     -1826     
+ Misses          524       29      -495     
  Partials          5        5               

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.