get max transfer bug fix

Author: moosecat2

programs/drift/src/state/lp_pool.rs

@@ -980,10 +980,10 @@ impl Constituent {
         let token_amount = self.get_full_token_amount(spot_market)?;
         let max_transfer = if token_amount < 0 {
             self.max_borrow_token_amount
-                .saturating_sub(token_amount.cast::<u64>()?)
+                .saturating_sub(token_amount.abs().cast::<u64>()?)
         } else {
             self.max_borrow_token_amount
-                .saturating_add(token_amount.cast::<u64>()?)
+                .saturating_add(token_amount.abs().cast::<u64>()?)
         };
 
         Ok(max_transfer)