Fix hardcoded strings (BugFix)

[baconYao]

Description

Recently, some SRU testings report a problem about dpkg-query: no packages found matching ubuntu-desktop

This is caused by a hardcoded string, ubuntu-desktop, in the script. It leads some devices have ubuntu-desktop-minimal package run into wrong checking target.

Resolved issues

• 202307-31862

Documentation

Tests

Sideload Test on Baoshan G510 (Desktop Image 03_19 version)

• https://certification.canonical.com/hardware/202405-34024/submission/382874/test-results/?term=miscellanea%2Fubuntu-desktop

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.12%. Comparing base (0e188c6) to head (cb4a402).
Report is 124 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1370   +/-   ##
=======================================
  Coverage   45.12%   45.12%           
=======================================
  Files         366      366           
  Lines       39058    39058           
  Branches     6607     6607           
=======================================
  Hits        17626    17626           
  Misses      20758    20758           
  Partials      674      674           

Flag	Coverage Δ
provider-base	18.62% <ø> (ø)

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[Hook25]

+1, ty for finding this issue