fix(operations): always force reinstalls if rocks are already installed

[mrcjkb]

Fixes #351

Note: This doesn't actually work with luarocks 3.11.0, see luarocks/luarocks#1657

[github-actions]

Review Checklist

Does this PR follow the Contribution Guidelines? Following is a partial checklist:

Proper conventional commit scoping:

• For example, fix(installer): some installer bugfix

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• Tested
  • Tests have been added.
  • Tested manually (steps in PR description).
• Updated documentation.

[vhyrro]

Should we wait for a new release of luarocks to drop, or are we merging this as-is?

[mrcjkb]

Should we wait for a new release of luarocks to drop, or are we merging this as-is?

Let's merge. The flag doesn't do any harm in the buggy release, and #340 hasn't been merged yet, so most users are still building luarocks from master.