Do Not Use Deprecated Behaviour

[willtebbutt]

Summary

We deprecated dtc in favour of approx_log_evidence a while, but were still calling it in our test suite in a couple of places.

Proposed changes

Replace all calls to dtc with approx_log_evidence

See above

What alternatives have you considered?

None

Breaking changes

None

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (58d858a) to head (dfc9496).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/util/TestUtils.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #418   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          11      11           
  Lines         381     381           
======================================
  Misses        381     381           

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