[fstab] discard 'discard' option

- we rather use 'fstrim' via systemd timmer
- see: https://github.com/calamares/calamares/issues/1395

src/modules/fstab/fstab.conf

@@ -21,10 +21,6 @@ efiMountOptions: umask=0077
 # filesystem is listed here, use those options, otherwise no additional
 # options are set (i.e. there is no *default* like in *mountOptions*).
 ssdExtraMountOptions:
-    ext4: discard
-    jfs: discard
-    xfs: discard
-    swap: discard
     btrfs: ssd,compress=zstd,commit=120
 
 # Additional options added to each line in /etc/crypttab