Negating a OneElement produces a OneElement

[jishnub]

Currently,

julia> O = OneElement(3, (5,5), (6,6));

julia> -O
6×6 Matrix{Int64}:
 0  0  0  0   0  0
 0  0  0  0   0  0
 0  0  0  0   0  0
 0  0  0  0   0  0
 0  0  0  0  -3  0
 0  0  0  0   0  0

After this,

julia> -O
6×6 OneElement{Int64, 2, Tuple{Int64, Int64}, Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}}}:
 ⋅  ⋅  ⋅  ⋅   ⋅  ⋅
 ⋅  ⋅  ⋅  ⋅   ⋅  ⋅
 ⋅  ⋅  ⋅  ⋅   ⋅  ⋅
 ⋅  ⋅  ⋅  ⋅   ⋅  ⋅
 ⋅  ⋅  ⋅  ⋅  -3  ⋅
 ⋅  ⋅  ⋅  ⋅   ⋅  ⋅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.90%. Comparing base (9868632) to head (6fd2604).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #381   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files           8        8           
  Lines        1110     1111    +1     
=======================================
+ Hits         1109     1110    +1     
  Misses          1        1           

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