Prevent playing the voice again when "Use" button in inventory is clicked

[miskatonicstudio]

Steps to reproduce:

• configure voice to play when an item is used
• enter inventory mode with an item
• click "Use" button
• click "Use" button again

Expected:

• voice should be played only once, when "Use" is first clicked

Actual:

• voice is played every time "Use" is clicked, because the mouse, even though it cannot move, still sends button events, and the focus is set on the "Use" button