chore: clarify negative interest time error message (#711) (#713)

(cherry picked from commit 7ccbcab)

Co-authored-by: Adam Moser <63419657+toteki@users.noreply.github.com>
Co-authored-by: Adam Wozniak <29418299+adamewozniak@users.noreply.github.com>

x/leverage/keeper/interest.go

@@ -72,10 +72,11 @@ func (k Keeper) AccrueAllInterest(ctx sdk.Context) error {
 	}
 
 	// calculate time elapsed since last interest accrual (measured in years for APR math)
-	yearsElapsed := sdk.NewDec(currentTime - prevInterestTime).QuoInt64(types.SecondsPerYear)
-	if yearsElapsed.IsNegative() {
-		return sdkerrors.Wrap(types.ErrNegativeTimeElapsed, yearsElapsed.String()+" years")
+	secondsElapsed := currentTime - prevInterestTime
+	if secondsElapsed < 0 {
+		return sdkerrors.Wrap(types.ErrNegativeTimeElapsed, fmt.Sprintf("%d seconds", secondsElapsed))
 	}
+	yearsElapsed := sdk.NewDec(secondsElapsed).QuoInt64(types.SecondsPerYear)
 
 	// fetch required parameters
 	tokens := k.GetAllRegisteredTokens(ctx)