Skip SSI injector in installer for accurate ini-dir readings

[bwoebi]

Otherwise 98-ddtrace.ini won't get created for example.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.76%. Comparing base (789048a) to head (cc63e31).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3472      +/-   ##
==========================================
- Coverage   61.86%   61.76%   -0.10%     
==========================================
  Files         142      142              
  Lines       12895    12895              
  Branches     1689     1689              
==========================================
- Hits         7977     7965      -12     
- Misses       4161     4171      +10     
- Partials      757      759       +2     

see 2 files with indirect coverage changes

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