Fix url encoding

[Koenkk]

Fixes Koenkk/zigbee2mqtt#26210

Note that I ran a reprocess before (#678)

[Nerivec]

I had removed the add.js encoding logic, for some reason that currently escapes me (haha)...
There aren't that many affected URLs, maybe it would be better to remove non-confirming characters entirely (i.e. rename files/fix indexes) and then add a check for new PRs to prevent introduction of new poorly named files (like alpha-num-dash only)?
I'll see if I can find my notes from back when I created the workflows, for the reason I had removed the encoding. It likely was messing with one of the automations in some way though.

[Koenkk]

I'm not sure, you basically have to disallow any character that has to be URL encoded. This seems like a robust solution.