Draft: deduplicate some symbols in the Polish `lefty` layout
This Merge Request aims to update the pl(lefty) layout. It removes duplicates and adds missing symbols from pl(basic) in place of those duplicates.
Old:
- 3rd_level + O = Ó (duplicate of 3rd_level + Q)
- 3rd_level + L = Ł (duplicate of 3rd_level + W)
- 3rd_level + N = Ń (duplicate of 3rd_level + D)
New:
- 3rd_level + O = Œ
- 3rd_level + L = Ð
- 3rd_level + l = ð
- 3rd_level + n = π
- 3rd_level + N = Ω