Only search browsable fields

[emptynick]

When using server-side pagination, all fields are shown in the search dropdown and are searchable, even when they are unticked in BREAD.
This PR prevents this behaviour as a non-browsable field should not be searchable.

[codecov]

Codecov Report

Merging #5281 (43c3f35) into 1.4 (3c2d314) will increase coverage by 0.08%.
The diff coverage is 40.00%.

❗ Current head 43c3f35 differs from pull request most recent head 00f2c54. Consider uploading reports for the commit 00f2c54 to get more accurate results

@@             Coverage Diff              @@
##                1.4    #5281      +/-   ##
============================================
+ Coverage     63.37%   63.45%   +0.08%     
+ Complexity     1394     1393       -1     
============================================
  Files           195      195              
  Lines          4120     4116       -4     
============================================
+ Hits           2611     2612       +1     
+ Misses         1509     1504       -5     

Impacted Files	Coverage Δ	Complexity Δ
src/Http/Controllers/VoyagerBaseController.php	61.53% <40.00%> (+0.79%)	147.00 <0.00> (-1.00)	⬆️

---

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 3c2d314...00f2c54. Read the comment docs.

[codecov-commenter]

Codecov Report

Merging #5281 (c6d87c8) into 1.4 (e22d212) will increase coverage by 0.08%.
The diff coverage is 40.00%.

@@             Coverage Diff              @@
##                1.4    #5281      +/-   ##
============================================
+ Coverage     63.37%   63.45%   +0.08%     
+ Complexity     1394     1393       -1     
============================================
  Files           195      195              
  Lines          4120     4116       -4     
============================================
+ Hits           2611     2612       +1     
+ Misses         1509     1504       -5     

Impacted Files	Coverage Δ	Complexity Δ
src/Http/Controllers/VoyagerBaseController.php	61.53% <40.00%> (+0.79%)	147.00 <0.00> (-1.00)	⬆️

---

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 e22d212...c6d87c8. Read the comment docs.