cleans up batch script

if user doesn't request mask, then we issue a cleaner call to `srun`

TurTLE/_code.py

@@ -786,7 +786,9 @@ class _code(_base):
         if 'executable_launcher' in self.host_info.keys():
             executable_launcher = self.host_info['executable_launcher']
         else:
-            executable_launcher = 'srun ${SLURM_CPU_BIND_OPTION}'
+            executable_launcher = 'srun'
+            if host_info['use_TurTLE_core_distribution']:
+                executable_launcher += ' ${SLURM_CPU_BIND_OPTION}'
             if host_info['use_vtune']:
                 if 'vtune_executable' not in host_info.keys():
                     host_info['vtune_executable'] = 'vtune'