Update animationinfo.cpp

[Nairdaa]

Deshitified the code abit...

Moved some repeated logic into a helper function (configureFrameDistribution) to handle frame distribution calculation.

Used std::max and std::clamp in places to ensure values stay within valid ranges.

Added validation for ticksPerFrame to avoid potential division by zero.

Added const where possible to indicate immutability.

[kphoenix137]

I think this will fail the formatting check. For example, we do functions like this:

void func()
{
}

But do conditionals like

if () {
} else {
}

Also namespaces:

namespace devilution {
} // namespace devilution

[AJenbo]

Please write a less shit title for your PRs and follow the project code style, there is a tool for it if you don't want to bother doing it manually, see https://github.com/diasurgical/devilutionX/wiki/Code-Style#formatting for details