Only take amount specified by user in improvement

src/discord/improvements.rs

@@ -78,7 +78,7 @@ pub async fn buy_improvement(
     User::try_take_funds(
         &ctx.data().db,
         ctx.author().id,
-        improvement_type.price() as u32,
+        amount,
     )?;
 
     let (has_improved, _) =