Fix tests to be agnostic to type printing

[goretkin]

JuliaLang/julia#37085 changed how type parameters
are printed, causing the following error:

Borders (issue #85): Test Failed at /home/runner/work/ImageFiltering.jl/ImageFiltering.jl/test/2d.jl:337
  Expression: imfilter(A, kern, Fill(0, (3,)))
    Expected: ArgumentError("Fill{Int64,1}(0, (3,), (3,)) lacks the proper padding sizes for an array with 2 dimensions")
      Thrown: ArgumentError("Fill{Int64, 1}(0, (3,), (3,)) lacks the proper padding sizes for an array with 2 dimensions")

See https://github.com/JuliaImages/ImageFiltering.jl/runs/1053929388?check_suite_focus=true#step:5:273 for the CI failure.

[codecov]

Codecov Report

Merging #183 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #183   +/-   ##
=======================================
  Coverage   77.60%   77.60%           
=======================================
  Files           9        9           
  Lines         978      978           
=======================================
  Hits          759      759           
  Misses        219      219           

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[johnnychen94]

Let's first check if it is stilling working wrt #182

[goretkin]

Did closing and opening trigger the CI? I wasn't sure why it didn't run to begin with.

[johnnychen94]

I disabled the fail-fast option 1172657 so that even if there's a test failure in nightly build, others are still running; a close and reopen would build the CI in the new master base.

[johnnychen94]

A similar ambiguity issue is found in JuliaArrays/OffsetArrays.jl#139 I'll go check it first this weekend and then revisit this PR.

[timholy]

The ambiguity issue might be changed or reverted; see JuliaLang/julia#36962 (comment). I'm sitting pat for a while in my other repos, or just transiently disabling the ambiguity test.

[timholy]

@johnnychen94, if this looks good to you please merge.