Fix scatter operator for nonstandard shapes

[TedThemistokleous]

remove standard() shape check for scatter inputs. Fixes error seen for non standard inputs

[codecov]

Codecov Report

Merging #2314 (2ff238d) into develop (c58e7d8) will decrease coverage by 0.01%.
Report is 3 commits behind head on develop.
The diff coverage is 100.00%.

❗ Current head 2ff238d differs from pull request most recent head fb6b07a. Consider uploading reports for the commit fb6b07a to get more accurate results

@@             Coverage Diff             @@
##           develop    #2314      +/-   ##
===========================================
- Coverage    91.45%   91.45%   -0.01%     
===========================================
  Files          433      433              
  Lines        16175    16174       -1     
===========================================
- Hits         14793    14792       -1     
  Misses        1382     1382              

Files	Coverage Δ
src/api/api.cpp	72.36% <ø> (ø)
src/api/include/migraphx/migraphx.hpp	98.63% <ø> (ø)
src/include/migraphx/auto_register.hpp	100.00% <ø> (ø)
src/include/migraphx/float_equal.hpp	100.00% <ø> (ø)
src/include/migraphx/generate.hpp	76.92% <ø> (ø)
src/include/migraphx/instruction_ref.hpp	100.00% <ø> (ø)
src/include/migraphx/matcher.hpp	97.13% <ø> (-0.02%)	⬇️
src/include/migraphx/op/nonmaxsuppression.hpp	98.47% <ø> (ø)
src/include/migraphx/op/roialign.hpp	99.16% <ø> (ø)
src/include/migraphx/op/scatter.hpp	100.00% <100.00%> (ø)
... and 4 more

[umangyadav]

add tests

[TedThemistokleous]

add tests

Added