lxpanel: fix several issues via upstream patches for trisquel-mini

Luis Guzmánrequested to merge
Ark74/package-helpers:bpo_patches_lxpanel_12 into ecne

Backport patches from upstream lxpanel to improve stability and functionality:

  • Fix scrolling issue in volume plugin (MR#46).
  • Handle 'not charging' battery state correctly (MR#53).
  • Prevent wincmd plugin from triggering button clicks incorrectly (MR#78).
  • Avoid panel freeze caused by pop-down menu detach (MR#84).
  • Restore disabled functionality in cpufreq plugin (MR#89, 4 commits)

These changes improve reliability in power and task management plugins.

fix #218 (closed)

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