removed extra lines of code

Author: jayneel-shah18

imagery/i.biomass/testsuite/test_i_biomass.py

@@ -41,21 +41,6 @@ def _create_input_rasters(cls):
                 "r.mapcalc", expression=f"{raster_name} = {expr}", overwrite=True
             )
 
-    @classmethod
-    def _create_reference_raster(cls):
-        """Create the reference raster for regression testing."""
-        cls.runModule(
-            "i.biomass",
-            fpar=cls.input_rasters["fpar"],
-            lightuse_efficiency=cls.input_rasters["lightuse_eff"],
-            latitude=cls.input_rasters["latitude"],
-            dayofyear=cls.input_rasters["dayofyear"],
-            transmissivity_singleway=cls.input_rasters["transmissivity"],
-            water_availability=cls.input_rasters["water"],
-            output="biomass_reference",
-            overwrite=True,
-        )
-
     @classmethod
     def tearDownClass(cls):
         """Clean up generated data and reset the region."""