[feature] Default "Re-stock detection setting" in settings

[legacik]

Version and OS
0.49.1 on linux/docker

Is your feature request related to a problem? Please describe.
I'm always frustrated when I forgot to change this option and then I have to open all my watches to be sure that it's set

Describe the solution you'd like
Global Setting in Settings what option is default when create/save watch in mode "Re-stock & Price detection for single product pages"

Re-stock detection:
      In Stock only (Out Of Stock -> In Stock only)
      Any availability changes
      Off, don't follow availability/restock

Now "In Stock only (Out Of Stock -> In Stock only)" is always selected by default, but I always prefer to set "Any availability changes". So it would be perfect to set it as default.