### Description
This is basically a hotfix to address the dark mode rollout from today. I'm 
new to contributing here and kind of in a hurry, sorry in advance if anything 
in this PR isn't perfect.

The current implementation of dark mode is already pretty good, but the tile 
display (i.e. the actual map) suffers greatly, since the tiles are simply 
dimmed using a CSS filter, losing a lot of contrast in the process.

I have borrowed the filter designed by @krjan02 from 
https://github.com/openstreetmap/openstreetmap-website/issues/2332#issuecomment-867821340
 and basically inserted it into the changes made in #4712.

Additionally, I have made sure that the tiles are not being filtered twice due 
to inheriting the filter from their parent element. Maybe selecting 
`.leaflet-tile` instead of `.leaflet-tile-container` would solve that problem, 
too, but I'm assuming that @AntonKhorev had a reason for targeting the 
container instead.

This is how it would look:

![image](https://github.com/user-attachments/assets/a34b8bed-2b67-49bd-bd61-717dde6fb6d1)

Note that the discussion in #2332 is apparently not over yet, and I don't 
want to preempt this. However, since dark mode rolled out today and I've 
already seen several people kind of unhappy with the way it looks now (which is 
made worse by the fact that there's no way to turn it off if your browser 
is set to prefer dark mode), I wanted to suggest a quick fix.

### How has this been tested?

That's the thing: I have tested this by editing the CSS in the browser 
developer tools, because I don't want to set up the whole environment for 
building/running the website locally. As I said, I'm new to this project. 
I'd appreciate if someone with a working setup could test the changes.

However, as you can see in the screenshot, the map key is correctly affected by 
the filter, as are the previews in the "Map Layers" pane.

Also, I'm an experienced developer, but not a front-end dev.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5325

-- Commit Summary --

  * Use CSS filter instead of dimming tiles

-- File Changes --

    M app/assets/stylesheets/common.scss (8)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5325.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5325.diff

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