Fix falling animation when clicking input fields in settings

[dooly123]

Summary

• When clicking into an input field in the settings provider window, the character would start playing the falling animation
• Root cause: BasisWalkMovementMode.Tick() zeroed the entire move vector (move = Vector3.zero) when MovementLock was active (input field focused), including the gravity/vertical component
• CharacterController.Move(Vector3.zero) produces no downward collision, so isGrounded returns false on the next frame. After the 0.1s fallingGracePeriod, IsFalling becomes true and the falling animation plays
• Fix: Only zero horizontal movement (move.x = 0; move.z = 0), preserving the vertical gravity component so the character stays grounded while the input field has focus

Test plan

• Open the settings provider window in desktop mode
• Click into any text input field (e.g. Admin tab UUID/Reason fields)
• Verify the character does not play the falling animation
• Verify the character cannot move horizontally while typing
• Verify normal movement and jumping work correctly after deselecting the input field

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