_needs_tracking_gap_to_julia: remove 'recursive' arg

[fingolfin]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.71%. Comparing base (24e17d6) to head (8809339).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1256   +/-   ##
=======================================
  Coverage   76.71%   76.71%           
=======================================
  Files          61       61           
  Lines        4887     4887           
=======================================
  Hits         3749     3749           
  Misses       1138     1138           

Files with missing lines	Coverage Δ
src/conversion.jl	95.23% <100.00%> (ø)
src/gap_to_julia.jl	97.60% <100.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ThomasBreuer]

O.k.
My interpretation of the change is:
recursive == true should be viewed as a condition for calling _needs_tracking_gap_to_julia, hence it should be checked before the function call.