Fix installation of gitshow/gitshowview completion symlinks

[hhoffstaette]

Description

Fixes #174
Cleanly applies to both 0.4.x and master.

Type of Change

• Bug fix (targets 0.4.x)

Testing

Added patch to Gentoo packagae, installed & verified that gitshow/gitshowview bash completions now work as expected.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.34%. Comparing base (e664ecc) to head (e11ca95).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #175   +/-   ##
=======================================
  Coverage   86.34%   86.34%           
=======================================
  Files          15       15           
  Lines        8156     8156           
  Branches     1671     1671           
=======================================
  Hits         7042     7042           
  Misses       1114     1114           

Flag	Coverage Δ
unittests	86.34% <ø> (ø)

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[twaugh]

Thanks!