Updates expected column count after strategy changes

Reflects an increase in generated columns from 13 to 15,
likely due to modifications in strategy logic or new features
in the tested method. Ensures tests accurately validate
the current output structure.

tests/test_strategy.py

@@ -199,7 +199,7 @@ class TestStrategyMethods(TestCase):
         )
         self.data.ta.strategy(custom, verbose=verbose, timed=strategy_timed, ordered=True)
         self.data.ta.tsignals(trend=self.data["AMATe_LR_20_50_2"], append=True)
-        self.assertEqual(len(self.data.columns), 13)
+        self.assertEqual(len(self.data.columns), 15)
 
     # @skip
     def test_momentum_category(self):