don't run setupIterativeReco when direct reco

[aTrotier]

related to #93

[codecov-commenter]

Codecov Report

Base: 64.20% // Head: 64.14% // Decreases project coverage by -0.05% :warning:

Coverage data is based on head (8bd24fa) compared to base (c8bf1e4). Patch coverage: 69.23% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #101 +/- ## ========================================== - Coverage 64.20% 64.14% -0.06% ========================================== Files 37 37 Lines 1679 1679 ========================================== - Hits 1078 1077 -1 - Misses 601 602 +1 ``` | [Impacted Files](https://codecov.io/gh/MagneticResonanceImaging/MRIReco.jl/pull/101?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MagneticResonanceImaging) | Coverage Δ | | |---|---|---| | [src/Reconstruction/Reconstruction.jl](https://codecov.io/gh/MagneticResonanceImaging/MRIReco.jl/pull/101/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MagneticResonanceImaging#diff-c3JjL1JlY29uc3RydWN0aW9uL1JlY29uc3RydWN0aW9uLmps) | `54.16% <69.23%> (-4.17%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MagneticResonanceImaging). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MagneticResonanceImaging)

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[tknopp]

looks good.