[RTADPA BW Tests] quick fix for Hlt1 BW test. len(inputs) < 2 breaks logging string

As can be seen https://eoslhcbhttp.cern.ch//eos/lhcb/storage/lhcbpr/logs/Moore/AllenInMoore_hlt1_bandwidth/lhcb-master.2230_2023-11-30_05:18:53_+0100/run.log the Hlt1 test currently breaks.

Upon further investigation it seems to just be because simply just because it only downloads a single file and the logging requires 'input[0], input[1]'.

Simple fix to instead only print input[0] if len(inputs) < 2, so it will still break if len(inputs)=0, i.e. correctly breaking but won't break for len(inputs)>=1.

python/MooreTests/run_bandwidth_test_jobs.py

@@ -196,8 +196,8 @@ if __name__ == '__main__':
                     f'Downloading inputs for bandwidth job to {args.cache_dirs[i]}'
                 )
                 logging.info(
-                    f'There are {len(inputs)} input files: [{inputs[0]}, {inputs[1]}, ... ]'
-                )
+                    f'There are {len(inputs)} input files: [{inputs[0]} ' +
+                    ']' if len(inputs) < 2 else '{inputs[1]}, ... ]')
                 kB_to_GB = 1e3
                 job_inputs[i] = download_mdf_inputs_locally(
                     inputs,