[FIX] styles: Fix package base path

[ales-erjavec]

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Issue

Fixes: https://github.com/biolab/orange3/issues/6837

This error causes missing dropdown indicators in the bottom toolbar

This does not apply and cannot be replicated using dark style

Changes

Fix package base path

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.62%. Comparing base (834ae0b) to head (1ed1266).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #306   +/-   ##
=======================================
  Coverage   76.62%   76.62%           
=======================================
  Files          99       99           
  Lines       21155    21155           
=======================================
  Hits        16209    16209           
  Misses       4946     4946           

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