fixing Clip.SCALE_BY_IMAGE

[shanaxel42]

overwrite the Imagestacks numpy array with the result of preserve_float_range() instead of the xarray

fixes #1184

[codecov-io]

Codecov Report

Merging #1193 into master will decrease coverage by 0.56%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1193      +/-   ##
==========================================
- Coverage   88.48%   87.91%   -0.57%     
==========================================
  Files         129      135       +6     
  Lines        4931     5518     +587     
==========================================
+ Hits         4363     4851     +488     
- Misses        568      667      +99

Impacted Files	Coverage Δ
starfish/imagestack/imagestack.py	94.62% <100%> (+0.63%)	⬆️
...h/spots/_detector/trackpy_local_max_peak_finder.py	90.14% <0%> (-1.53%)	⬇️
starfish/compat.py	10.07% <0%> (-0.77%)	⬇️
starfish/image/_filter/linear_unmixing.py	96.07% <0%> (-0.7%)	⬇️
starfish/test/full_pipelines/api/test_iss_api.py	100% <0%> (ø)	⬆️
starfish/imagestack/test/factories/with_coords.py	100% <0%> (ø)
starfish/imagestack/test/factories/unique_tiles.py	97.67% <0%> (ø)
...rfish/imagestack/test/factories/synthetic_stack.py	100% <0%> (ø)
starfish/intensity_table/overlap.py	96.07% <0%> (ø)
starfish/imagestack/test/factories/__init__.py	100% <0%> (ø)
... and 7 more

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