Don't allow pinning on wildcard searches

[androolloyd]

Description

Change the can_pin helper to prevent pinning on the wild card searches.

Refers/Fixes

Testing

[codecov]

Codecov Report

Merging #6694 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6694      +/-   ##
==========================================
- Coverage   27.12%   27.11%   -0.01%     
==========================================
  Files         292      292              
  Lines       27156    27159       +3     
  Branches     3990     3992       +2     
==========================================
  Hits         7365     7365              
- Misses      19518    19521       +3     
  Partials      273      273              

Impacted Files	Coverage Δ
app/townsquare/utils.py	16.66% <0.00%> (-1.52%)	⬇️

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