x11-servers/xwayland-devel: return to freedesktop mirror

"mirror" seems to lag behind "freedesktop" nowadays. As the repo
combined with all forks grew in size since then adjust patches:

-index d3dd54364..bcbf98371 100644
+index d3dd543642..bcbf983717 100644

This reverts commit d3130ade8f86d30d34dfa17d14cc5cbba7f7d8274.