Library Editor: Don't change grid settings to default if was previously changed

[EdizonTN]

VERSION / OS / ENVIRONMENT

LibrePCB Version: 1.1.0
Git Revision: 18a3d45
Build Date: 2024-04-03T09:45:54
Build Author: LibrePCB CI
Qt Version: 5.15.2 (built against 5.15.2)
CPU Architecture: x86_64
Operating System: Windows 10 Version 2009
Platform Plugin: windows
TLS Library: OpenSSL 1.1.1v 1 Aug 2023
OCC Library: OCCT 7.7.2

SUMMARY

When I enter to package editing mode, grid is preset to default without respect to previous settings.

STEPS TO REPRODUCE

Open Library editor, select some package and doubleclick to edit it.
Change grid for some new settings, save package and close package editor.
Reopen it and check grid settings.

EXPECTED RESULTS

I expected same grid settings as I set in previous.

ACTUAL RESULTS

Grid is set to default (2,54 mm) always.