Use FtPrecise in interest calculation

tests/leverage/test_interest.py

@@ -1,14 +1,14 @@
-from decimal import Decimal
 from math import isclose
 
 import pytest
 
 from freqtrade.leverage import interest
+from freqtrade.util import FtPrecise
 
 
-ten_mins = Decimal(1 / 6)
-five_hours = Decimal(5.0)
-twentyfive_hours = Decimal(25.0)
+ten_mins = FtPrecise(1 / 6)
+five_hours = FtPrecise(5.0)
+twentyfive_hours = FtPrecise(25.0)
 
 
 @pytest.mark.parametrize('exchange,interest_rate,hours,expected', [
@@ -28,11 +28,11 @@ twentyfive_hours = Decimal(25.0)
     ('ftx', 0.00025, twentyfive_hours, 0.015625),
 ])
 def test_interest(exchange, interest_rate, hours, expected):
-    borrowed = Decimal(60.0)
+    borrowed = FtPrecise(60.0)
 
     assert isclose(interest(
         exchange_name=exchange,
         borrowed=borrowed,
-        rate=Decimal(interest_rate),
+        rate=FtPrecise(interest_rate),
         hours=hours
     ), expected)

tests/rpc/test_rpc_apiserver.py

@@ -892,7 +892,7 @@ def test_api_performance(botclient, fee):
     assert_response(rc)
     assert len(rc.json()) == 2
     assert rc.json() == [{'count': 1, 'pair': 'LTC/ETH', 'profit': 7.61, 'profit_pct': 7.61,
-                          'profit_ratio': 0.07609203, 'profit_abs': 0.01872279},
+                          'profit_ratio': 0.07609203, 'profit_abs': 0.0187228},
                          {'count': 1, 'pair': 'XRP/ETH', 'profit': -5.57, 'profit_pct': -5.57,
                           'profit_ratio': -0.05570419, 'profit_abs': -0.1150375}]