Fix detector display by replacing println with print

[gdalle]

This fixes the following display:

julia> using ADTypes, SparseConnectivityTracer

julia> backend = AutoSparse(AutoForwardDiff(), sparsity_detector=TracerSparsityDetector())
AutoSparse(dense_ad=AutoForwardDiff(), sparsity_detector=TracerSparsityDetector()
)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.05%. Comparing base (702b2d0) to head (f7290a0).

Files with missing lines	Patch %	Lines
src/adtypes_interface.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #201   +/-   ##
=======================================
  Coverage   91.05%   91.05%           
=======================================
  Files          47       47           
  Lines        2080     2080           
=======================================
  Hits         1894     1894           
  Misses        186      186           

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[adrhill]

Thanks!