[airos] fix indentation in renderer cleanup

Author: edoput

netjsonconfig/backends/airos/renderers.py

@@ -5,6 +5,6 @@ class AirOsRenderer(BaseRenderer):
 
     def cleanup(self, output):
         stripped = [
-                a.strip() for a in output.splitlines() if a.strip()
-                ]
+            a.strip() for a in output.splitlines() if a.strip()
+        ]
         return '\n'.join(stripped)