Use model to toggle research mode

Just a nice bit of encapsulation, rather than passing `current_service`
through to a method on `current_service`.

app/main/views/service_settings.py

@@ -221,9 +221,7 @@ def service_switch_live(service_id):
 @login_required
 @user_is_platform_admin
 def service_switch_research_mode(service_id):
-    current_service.update_with_properties(
-        {'research_mode': not current_service.research_mode}
-    )
+    current_service.toggle_research_mode()
     return redirect(url_for('.service_settings', service_id=service_id))
 
 

app/models/service.py

@@ -78,6 +78,11 @@ class Service():
 
         self.update_with_properties(data)
 
+    def toggle_research_mode(self):
+        self.update_with_properties({
+            'research_mode': not self.research_mode,
+        })
+
     @property
     def trial_mode(self):
         return self._dict['restricted']