Re #21598 Make total scattering test independent of focus

The total scattering system test was made to read its own input file
instead of using the output of the focus test, so that the focus reference
file could be updated without breaking the total scattering test

Testing/Data/SystemTest/ISIS_Powder/input/ISIS_Powder-POLARIS98533_TotalScatteringInput.nxs.md5

+fb33507ac0702dd7d513d79e352637b4
\ No newline at end of file

Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py

@@ -39,6 +39,8 @@ calibration_dir = os.path.join(input_dir, calibration_folder_name)
 spline_path = os.path.join(calibration_dir, spline_rel_path)
 unsplined_van_path = os.path.join(calibration_dir, unsplined_van_rel_path)
 
+total_scattering_input_file = os.path.join(input_dir, "ISIS_Powder-POLARIS98533_TotalScatteringInput.nxs")
+
 
 class CreateVanadiumTest(stresstesting.MantidStressTest):
 
@@ -102,7 +104,7 @@ class TotalScatteringTest(stresstesting.MantidStressTest):
 
     def runTest(self):
         # Load Focused ws
-        mantid.LoadNexus(Filename="ISIS_Powder-POLARIS98533_FocusSempty.nxs", OutputWorkspace='98533-Results-TOF-Grp')
+        mantid.LoadNexus(Filename=total_scattering_input_file, OutputWorkspace='98533-Results-TOF-Grp')
         self.pdf_output = run_total_scattering('98533', False)
 
     def validate(self):
@@ -131,6 +133,7 @@ def _gen_required_files():
     # Generate file names of form "INSTxxxxx.nxs"
     input_files = [os.path.join(input_dir, (inst_name + "000" + number + ".nxs")) for number in required_run_numbers]
     input_files.append(calibration_map_path)
+    input_files.append(os.path.join(input_dir, "ISIS_Powder-POLARIS98533_TotalScatteringInput.nxs"))
     return input_files