Remove unimplemented searchbar from project view

[noerw]

This came up in discord; there is no handler for the search params on a project, and it is unclear to me how this searchbar should behave. As a quickfix remove it.
The searchbar was probably added by copy/paste error

[codecov-commenter]

Codecov Report

Merging #15901 (6785b23) into main (a32bfd8) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #15901      +/-   ##
==========================================
- Coverage   44.01%   43.99%   -0.03%     
==========================================
  Files         681      681              
  Lines       82336    82336              
==========================================
- Hits        36237    36220      -17     
- Misses      40195    40211      +16     
- Partials     5904     5905       +1     

Impacted Files	Coverage Δ
modules/auth/openid/discovery_cache.go	10.52% <0.00%> (-89.48%)	⬇️
models/repo_list.go	77.04% <0.00%> (-0.78%)	⬇️
services/pull/pull.go	43.37% <0.00%> (ø)
models/unit.go	49.31% <0.00%> (+2.73%)	⬆️

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[lunny]

Please send backport to v1.14