Re #21350 Update total scattering system test reference values

The new cropping ranges meant that the intensity of peaks in
TotalScatteringTest was reduced, and the peak used for reference was at a
different index. It was decided that, since total scattering is at such
an early stage of development, it made most sense to just make the test
check for the new values instead

Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py

@@ -107,14 +107,14 @@ class TotalScatteringTest(stresstesting.MantidStressTest):
     def validate(self):
         # Whilst total scattering is in development, the validation will avoid using reference files as they will have
         # to be updated very frequently. In the meantime, the expected peak in the PDF at ~3.9 Angstrom will be checked.
-        # After rebin this is at X index 51
-        expected_peak_values = [0.0187231,
-                                0.0583586,
-                                0.2241280,
-                                0.2752230,
-                                1.0252800]
+        # After rebin this is at X index 37
+        expected_peak_values = [0.0002294,
+                                0.0606328,
+                                0.2007917,
+                                0.1436630,
+                                0.9823244]
         for index, ws in enumerate(self.pdf_output):
-            self.assertAlmostEqual(ws.dataY(0)[51], expected_peak_values[index], places=3)
+            self.assertAlmostEqual(ws.dataY(0)[37], expected_peak_values[index], places=3)
 
 
 def run_total_scattering(run_number, merge_banks):