Allow Trundle to cast his W while moving

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They just need to do what they did for flash and have it not interrupt movement commands. Currently, you can still move while casting it, you just have to click where you want to go again. This would be a great QoL buff for our favorite troll.

Theres still a .25 second interruption in movement for the cast time. Its not super noticeable but its enough to slow you down in chasing or escaping.