Wrong media URLs shown

[madduck]

I just noticed that while Riot showed me a screenshot in a room, which had the URL (not the thumbnail URL, but the one of the actual image)

https://matrix.madduck.net/_matrix/media/v1/download/gruenhage.xyz/wPginFhvkMwSxTGvQIMpaJsV

this was displayed in the IRC channel seen through matrix-ircd as:

https://matrix.madduck.net//media/r0/download/gruenhage.xyz/wPginFhvkMwSxTGvQIMpaJsV

which is a 404. There are two differences:

• _matrix is missing in the first path component;
• r0 is used instead of v1in the 3rd path component.

[erikjohnston]

https://github.com/matrix-org/matrix-ircd/commit/cac14b6ba329c5e54311b4e6ea07fd165a68d0e5 should fix this