This fixes a regression introduced in commit f1e35a6 (modernize for loops 2).

When modernizing the for loop from traditional style to range syntax,
the manual i++ increment was not removed, causing a double-increment bug.

The for..range statement automatically increments the index variable,
so the manual i++ at line 606 caused the loop to skip indices and
eventually panic with 'index out of range'.

Fixes the panic that occurs when SleepTimeThreshold != INFINITY.

Instead of removing the manual i++ increment, revert the for loop to its
original pattern before PR jakecoffman#43. This maintains consistency with the
pre-modernization code structure where loops with conditional continue
statements use manual index management.

The original pattern was:
for i := 0; i < len(space.dynamicBodies); {
    if condition {
        continue  // Skip i++
    }
    i++  // Increment only when not skipping
}