Hides the buy button on click to prevent duping

[shiank98]

[gustavovitor]

This code impact in any '.green' class button, i dont remember, but have one or two buttons in administrator panel, if this code, these buttons have impacts. Is more intersing you create a new class for this.

[shiank98]

pretty sure it wont affect any other page than the shop cuz I only added it on the shop

[tomirons]

@shiank98 I don't like hiding the button, I'd prefer the button to be disabled. If you make this change, there is already a disabled class, but you would need to add the disabled attribute to the button as well.