Fix base radius of Cleave + Vaal Cleave

[LocalIdentity]

Fixes #10027

Description of the problem being solved:

The skills had 2 stats mapped to the radiusExtra skill mod so it would randomly choose 1 of them on launch.
Now uses a base mod for the nearby enemy mod so that it always works properly

Link to a build that showcases this PR:

https://maxroll.gg/poe/pob/2pr30f0t

Before screenshot:

After screenshot:

[TheCityVault]

Verified against dev head (PR #10045): the same repro build now prints
AreaOfEffectRadius 32 on 8/8 fresh processes — the flap is gone and the value
matches the expected sum (20 base + 11 level-scaled + 1 per-nearby). Moving the
per-nearby component to an AreaOfEffect BASE mod fixes both halves at once.

We also re-scanned all 1,513 skill blocks at dev head for the same pattern (two
stats writing one skillData key). Both reachable sites are gone; the only
structural match left is StalkingPustule, and we believe it's unreachable — its
own-map stat never seems to materialize at runtime for the item-granted skill, so
there's no coin to flip. Flagging it in case that reasoning is wrong, since you'd
know better than we would. The 24 new skill blocks on dev head don't add any new
sites.

Thanks for the quick turnaround.