supress debug toolbar in .travis.yml

[chibie]

Description

Supress debug toolbar in travis configuration. Django debug_toolbar isn't required while running tests.

/grants/categories/ and /quests/new return Internal Server Error which causes travis checks to fail

debug_toolbar produces this error FileNotFoundError: [Errno 2] No such file or directory: '/home/travis/build/gitcoinco/web/assets'

[codecov]

Codecov Report

Merging #7505 into master will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7505      +/-   ##
==========================================
- Coverage   26.31%   26.12%   -0.19%     
==========================================
  Files         307      307              
  Lines       30652    30652              
  Branches     4539     4539              
==========================================
- Hits         8067     8009      -58     
- Misses      22301    22369      +68     
+ Partials      284      274      -10     

Impacted Files	Coverage Δ
app/app/context.py	0.00% <0.00%> (-51.86%)	⬇️
app/retail/templatetags/matches.py	62.50% <0.00%> (-37.50%)	⬇️
app/app/settings.py	80.86% <0.00%> (-1.74%)	⬇️
app/chat/tasks.py	11.80% <0.00%> (-1.11%)	⬇️
app/retail/views.py	20.76% <0.00%> (-0.96%)	⬇️
app/dashboard/views.py	10.50% <0.00%> (+0.03%)	⬆️

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