net/xrdp: Update to 0.10.4
While here, fix typo in MASTER_SITES URL.
Changes: https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.4
The upstream release was half a day too late for the 2025Q3 branch, but
this version is the best one to use during this quarter.
(cherry picked from commit ab7f896d1cefd6b778aedf66ca075e1e431e674a)