Fix Blade Blast default stage cap

[OursCodeur]

Description of the problem being solved

Fixes #9836.

Blade Blast was modeled with Multiplier:BladeBlastMaxStages set to 900. I aligned the internal value to the tooltip's so #9728 works as intended.

Steps taken to verify a working solution

• Verified a fresh Blade Blast skill now defaults to 50 stages in the sidebar and Calcs skill controls.
• Added regression coverage setting Blade Blast to 51 stages to confirm damage doesn't increase past the 50-stage cap.

[jwfiredragon]

Why 50 stages? Lingering blades are capped to 40, so 50 is impossible unless the cap is per skill (which I don't think it is but am not sure of).

[OursCodeur]

Why 50 stages? Lingering blades are capped to 40, so 50 is impossible unless the cap is per skill (which I don't think it is but am not sure of).

[Wires77]

There's an infamous mod that gives more blades: "Skills that leave Lingering Blades have +(5-10) to Maximum Lingering Blades"

[LocalIdentity]

I looked into handling this correctly by using the mods from gear and bladefall to set the cap but it runs into the issue where it runs after CalcActiveSkill where stages calcs are done so it never properly works
Will use this until the time comes when we want to properly fix it