Fix search using remaing terms

[Neraste]

#181 introduced the possibility to search more than songs, and was a refactor of the search engine. The implementation prior the PR allowed to find the conjunction of remaining terms (i.e., without using the mini-language keywords), when the implementation after it finds the disjunction of these terms. This behavior was not tested.

This PR reestablishes the conjunction of remaining terms for all type of queries:

• Songs;
• Artists;
• Song tags;
• Works;
• Playlist entries;
• Player errors; and
• Users.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.71%. Comparing base (9f85bc3) to head (e3badbf).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #193   +/-   ##
========================================
  Coverage    98.70%   98.71%           
========================================
  Files           84       84           
  Lines         2003     2017   +14     
========================================
+ Hits          1977     1991   +14     
  Misses          26       26           

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