preferences: Update images
I planned to update images for the preferences where things had changed, but then found entries that were 2.10 branch only, so let's start with sending in the images for the 2-10 branch.
Most images are probably improvements on master as well, but in the following files I found entries not present in GIMP 2.99:
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prefs-toolbox.png : Menu mode/"Show on hover" is 2-10 only for now.
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prefs-interface.png: "Use compact sliders" is 2-10 only for now.
Dark symbolic theme used, GIMP 2.10.32 in Debian testing.