Erik Arvstedt 89bd29a905 arena_allocator/reset: avoid zero-capacity allocations
1. When the arena is already empty, resetting with `retain_capacity` no longer
   results in allocating a buffer with zero capacity.
   This behavior was previously intended by the `(current_capacity == 0)` check,
   but wasn't correctly implemented.

2. Resetting with `.{ .retain_with_limit = 0 }` is now equivalent to
   `free_all` and a new buffer with zero capacity is no longer created.
   This is a useful side-effect of the above fixes.
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