Remove unintentional libddwaf require

[Strech]

What does this PR do?

Remove unintentional require libddwaf library from the Context class.

Motivation:

This was a mistake which slipped through the review and coding.
Related: #4077

Change log entry

Yes.
Fix: Remove unnecessary require of libddwaf library which may cause crashing.

Additional Notes:

Probably this should be released as 2.5.1 patch release

How to test the change?

Ideally just CI.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.73%. Comparing base (25d6fb8) to head (20145a5).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4078      +/-   ##
==========================================
- Coverage   97.73%   97.73%   -0.01%     
==========================================
  Files        1338     1338              
  Lines       80249    80252       +3     
  Branches     4016     4017       +1     
==========================================
- Hits        78434    78433       -1     
- Misses       1815     1819       +4     

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