Fix: zi ensure single trigger mode is always set

This get reset when enabling the read

qcodes/instrument_drivers/ZI/ZIUHFLI.py

@@ -390,6 +390,13 @@ def get(self):
         params['scope_runstop'].set('run')
 
         log.info('[*] Starting ZI scope acquisition.')
+        # one shot per trigger. This needs to be set every time
+        # a the scope is enabled as below using scope_runstop
+        # We should also test if scopeModule/mode and scopeModule/averager/weight
+        # needs to be set every time since we are creating a new scopemodule
+        # here
+        self._instrument.daq.setInt('/{}/scopes/0/single'.format(self._instrument.device), 1)
+        self._instrument.daq.sync()
         # Start something... hauling data from the scopeModule?
         scope.execute()