overlord/install/install.go: use plainkey for save key

[valentindavid]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 31.18280% with 64 lines in your changes missing coverage. Please review.

Please upload report for BASE (fde-manager-features@bd4c3ff). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
overlord/install/install.go	35.71%	18 Missing and 9 partials ⚠️
secboot/keys/plainkey.go	0.00%	14 Missing ⚠️
secboot/keys/plainkey_nosb.go	0.00%	13 Missing ⚠️
boot/makebootable.go	11.11%	8 Missing ⚠️
boot/seal.go	71.42%	2 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##             fde-manager-features   #14706   +/-   ##
=======================================================
  Coverage                        ?   78.80%           
=======================================================
  Files                           ?     1095           
  Lines                           ?   147907           
  Branches                        ?        0           
=======================================================
  Hits                            ?   116552           
  Misses                          ?    24070           
  Partials                        ?     7285           

Flag	Coverage Δ
unittests	78.80% <31.18%> (?)

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