xorg-server: Move to new URL to avoid redirect

    [BEE] fetching https://ftp.x.org/pub/individual/xserver/xorg-server-1.20.11.tar.bz2
    --2021-04-13 16:24:58--  https://ftp.x.org/pub/individual/xserver/xorg-server-1.20.11.tar.bz2
    Resolving ftp.x.org... 131.252.210.176, 2610:10:20:722:a800:ff:feda:470f
    Connecting to ftp.x.org|131.252.210.176|:443... connected.
    HTTP request sent, awaiting response... 301 Moved Permanently
    Location: https://ftp.x.org/archive//individual/xserver/xorg-server-1.20.11.tar.bz2 [following]
    --2021-04-13 16:24:58--  https://ftp.x.org/archive//individual/xserver/xorg-server-1.20.11.tar.bz2
    Reusing existing connection to ftp.x.org:443.
    HTTP request sent, awaiting response... 200 OK
    Length: 6476116 (6.2M) [application/x-bzip2]
    Saving to: ‘/dev/shm/bee-pmenzel/xorg-server/files/xorg-server-1.20.11.tar.bz2’

xorg-server.be0

@@ -9,7 +9,7 @@
 ## The source URL(s) define the location of the sources that will be
 ## downloaded. Version variables may be used to simplify reuse of this bee-file.
 
-SRCURL[0]="https://ftp.x.org/pub/individual/xserver/xorg-server-${PKGVERSION}.tar.bz2"
+SRCURL[0]="https://ftp.x.org/archive/individual/xserver/xorg-server-${PKGVERSION}.tar.bz2"
 
 ###############################################################################
 ## Add URLs/pathes to patch files to the PATCHURL array.