fix(filters): rollback a change made in PR #288 causing preset issues

[ghiscoding]

• rolling back this change (in previous PR feat(filters): display operator into input text filter from Grid Presets #288) since Aurelia-Slickgrid filter presets on Client Example was no longer working as expected

[codecov]

Codecov Report

Merging #295 (18ffc0c) into master (7111675) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #295   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          209       209           
  Lines        12486     12486           
  Branches      4279      4279           
=========================================
  Hits         12486     12486           

Impacted Files	Coverage Δ
packages/common/src/services/filter.service.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7111675...18ffc0c. Read the comment docs.