Confirm fn_17556 (GroundGeometry::Build)

Batch #17263 by SapitoSucio: 0 byte-identical, 1 confirmed by peer review.

- fn_17556 GroundGeometry::Build: logic confirmed by peer review (already on main)

Peer-reviewed-by: eAthena, Toshiro, bibinir
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).

Source/Contents/Ground/GroundGeometry.cpp

@@ -22,8 +22,7 @@ namespace {
 
   // INLINED
   float InverseLength(float squared) {
-    const float length = SquareRoot(squared);
-    return 1.0f / length;
+    return 1.0f / SquareRoot(squared);
   }
 
   // INLINED