overlord/h/c/umount: remove handling of required parameter

[mardy]

go-flags already does this check. Thanks Miguel for spotting it!

[miguelpires]

LGTM, thanks!

[codecov-commenter]

Codecov Report

Merging #11266 (3529381) into master (9fde45f) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11266      +/-   ##
==========================================
- Coverage   78.37%   78.37%   -0.01%     
==========================================
  Files         926      926              
  Lines      105602   105599       -3     
==========================================
- Hits        82766    82761       -5     
- Misses      17693    17695       +2     
  Partials     5143     5143              

Flag	Coverage Δ
unittests	78.37% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
overlord/hookstate/ctlcmd/umount.go	100.00% <ø> (ø)
overlord/hookstate/hookmgr.go	74.67% <0.00%> (-0.65%)	⬇️
overlord/ifacestate/helpers.go	76.96% <0.00%> (-0.49%)	⬇️
cmd/snap/cmd_debug_state.go	70.18% <0.00%> (-0.46%)	⬇️
store/cache.go	71.15% <0.00%> (+1.92%)	⬆️
osutil/synctree.go	79.24% <0.00%> (+2.83%)	⬆️

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[bboozzoo]

LGTM

[anonymouse64]

lgtm