Optimize fstab for btrfs performance and stability

Merged Matti Hyttinen requested to merge Chrysostomus/calamares:patch-2 into development

Discard and autodefrag are not good options for ssd. Additionally, autodefrag can cause problems with virtual machines. Ssd and commit=120 increase performance on ssd drives, and zstd offers better compression than lzo. One could use it as default even for hdd:s. @philm @oberon

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