Imported palettes not available in palette at the bottom
#### Summary:
When I import a gpl palette in the Swatches dialog, it becomes available only in the Swatches dialog. I would have expected the palette to become available everywhere.
#### Steps to reproduce:
- open Inkscape
- open View > Swatches
- Import a gpl file
#### What happened?
* the palette becomes available to select in the Swatches dialog
* it is not available in the palette at the bottom of the window
#### What should have happened?
It should be available everywhere.
#### Version info
```
Inkscape 1.4-rc1 (eed6b5426a, 2024-10-06)
Compile (Run)
GLib version: 2.72.4
GTK version: 3.24.33 (3.24.33)
glibmm version: 2.66.2
gtkmm version: 3.24.5
libxml2 version: 2.9.13
libxslt version: 1.1.34
Cairo version: 1.16.0 (1.16.0)
Pango version: 1.50.6 (1.50.6)
HarfBuzz version: 2.7.4 (2.7.4)
OS version: Linux Mint 21.3
```
issue