Don't add a LIKE condition when it's not needed

[tcitworld]

Detected as long query:

SELECT `c`.`carddata`, `c`.`uri` FROM `oc_cards` c WHERE `c`.`id` IN (
    SELECT DISTINCT `cp`.`cardid` FROM `oc_cards_properties` cp WHERE (
           `cp`.`addressbookid` = '2') AND 
           (`cp`.`name` = 'FN') AND 
           (`cp`.`value`  COLLATE UTF8_general_ci LIKE '%%')
);

[mention-bot]

@tcitworld, thanks for your PR! By analyzing the history of the files in this pull request, we identified @DeepDiver1975, @schiessle and @nickvergessen to be potential reviewers.

[codecov]

Codecov Report

Merging #6633 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #6633      +/-   ##
============================================
+ Coverage     53.06%   53.06%   +<.01%     
- Complexity    22553    22554       +1     
============================================
  Files          1414     1414              
  Lines         87745    87746       +1     
  Branches       1340     1340              
============================================
+ Hits          46560    46566       +6     
+ Misses        41185    41180       -5

Impacted Files	Coverage Δ	Complexity Δ
apps/dav/lib/CardDAV/CardDavBackend.php	85.56% <100%> (+0.03%)	89 <0> (+1)	⬆️
core/js/js.js	61.83% <0%> (+0.55%)	0% <0%> (ø)	⬇️

[rullzer]

Makes sense

[nickvergessen]

Backport to 12?

[MorrisJobke]

Backport to 12?

#6945