Fix show for OffsetRanges (redo #200)

[jishnub]

Unfortunately my attempt at not displaying the parent types while printing OffsetRanges in #200 was buggy, and was not caught because of insufficient tests. This PR reverts that, so now the parent types will be printed as it used to be before #200. There might be a better solution using no_offset_view, but it's better to be conservative.

After this:

julia> r = OffsetVector(Base.IdentityUnitRange(-3:4), 2)
Base.IdentityUnitRange(-3:4) with indices -1:6

[codecov]

Codecov Report

Merging #203 (f5e0946) into master (0a5dc88) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #203   +/-   ##
=======================================
  Coverage   98.25%   98.25%           
=======================================
  Files           5        5           
  Lines         286      286           
=======================================
  Hits          281      281           
  Misses          5        5           

Impacted Files	Coverage Δ
src/OffsetArrays.jl	97.94% <100.00%> (ø)

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